Difference Between Two Population Means

Here, we describe estimation and hypothesis-testing procedures for the difference between two population means when the samples are dependent. In a case of two dependent samples, two data values—one for each sample—are collected from the same source (or element) and, hence, these are also called paired or matched samples. For example, we may want to make inferences about the mean weight loss for members of a health club after they have gone through an exercise program for a certain period of time.To do so, suppose we select a sample of 15 members of this health club and record their weights before and after the program. In this example, both sets of data are collected from the same 15 persons, once before and once after the program. Thus, although there are two samples, they contain the same 15 persons. This is an example of paired (or dependent or matched) samples. The procedures to make confidence intervals and test hypotheses in the case of paired samples are differe nt from the ones for independent samples.Two samples are said to be paired or matched samples when for each data value collected from one sample there is a corresponding data value collected from the second sample, and both these data values are collected from the same source. As another example of paired samples, suppose an agronomist wants to measure the effect of a new brand of fertilizer on the yield of potatoes. To do so, he selects 10 pieces of land and divides each piece into two portions. Then he randomly assigns one of the two portions from each piece of land to grow potatoes without using fertilizer (or using some other brand of fertilizer).The second portion from each piece of land is used to grow potatoes with the new brand of fertilizer. Thus, he will have 10 pairs of data values. Then, using the procedure to be discussed in this article, he will make inferences about the difference in the mean yields of potatoes with and without the new fertilizer. The question arises, why does the agronomist not choose 10 pieces of land on which to grow potatoes without using the new brand of fertilizer and another 10 pieces of land to grow potatoes by using the new brand of fertilizer?If he does so, the effect of the fertilizer might be confused with the effects due to soil differences at different locations. Thus, he will not be able to isolate the effect of the new brand of fertilizer on the yield of potatoes. Consequently, the results will not be reliable. By choosing 10 pieces of land and then dividing each of them into two portions, the researcher decreases the possibility that the difference in the productivities of different pieces of land affects the results.

comparing computers essays

comparing computers essays At home I have Microsoft Office, not the 2000 version but I can tell you this program is like no other when it comes to presentation and processor capabilities. It is the cadillac of the programs. I have contemplated getting the office 2000 version however I am told it is very complicated and not generally for home or small business use. It is generally for the company that networks and moves around on the world wide web. As far as their database goes, it is also fairly good with Microsoft Access however transporting the database into other programs is still difficult in that it is complicated. Publisher 2000 is again an added boost to this program since it is able to help you with any publication/presentation, mailings and so on. The cost is high also which makes it less attractive for the small business owner. Microsoft Back Office, Small Business Server, is just that, a server. The cost is more reasonable however its capabilities are limited. Arc Server IT 6.6 is an excellent program for a small business because it has great database movement capabilities. Its backup and security programs are terrific which is paramount for a small business. I have know small business owners who have spent hours trying to recoup their database. It can cost them a lot of time and money with this type of a problem. This company also provides help, 24 hours of the day which is the biggest help for these store owners. There is almost no amount of money that can surpass this quality. ...

Gods Laws Essays - Black Holes, Hypothetical Astronomical Objects

God's Laws Essays - Black Holes, Hypothetical Astronomical Objects God's Laws The oldest profession in the world is not what would be commonly accepted in society. Before a woman had a chance to sell her body, people looked up at the stars and wondered what they were. They made figures out of the shapes they made. As we advanced through scientific research many other doors opened that allowed us to see what it was the earth is existing in. Our constant need to explain what is happening comes from our want to control. Knowledge is power, and nothing is more unexplained that the universe. Time is interlocked and must be understood if we want to accomplish a deep knowledge of the cosmos. Commonly it was thought that there was no such knowledge. The author Stephen Hawking had shown many otherwise. His books give a deep history and knowledge of how the universe exists. He also explains many others aspects of the cosmos and puts his works in an understandable writing style. He puts the largest accent on his studies of black holes. These are fascinating happening and the way to understanding the universe and several others can be found through the study of black holes. There are several features of black holes that makes them incredibly fascinating. The first one would be the common misconception of how noting can escape a black hole. This is true in most points. If nothing can escape them, how does one detect a black hole? Stephen Hawking discovered a fascinating aspect using anti-particle properties. He found that when matter is pulled into a black hole by gravity matter is constantly being pulled apart. This causes the anti-parties of matter to be throw away at incredible rates. This happens at consistent times. The large amount of gamma radiation let off by this is how Mr. Hawking now finds black holes. Another interesting concept of black holes is they are can be formed other ways than by the end of a stars life. Stephen Hawking and his associates found that any nuclear explosion can cause the birth of a black hole. Hawking stated that is all the heavy water, a component used in nuclear weapons, was used to create a nuclear explosion a black hole the size of earth would be created. He also stated no one would be around to witness the creation. It would have been caused by the implosion of earth at a massive rate and the amount of energy produced by the nuclear explosion. This had me wondering. Stephen Hawking also stated that is a black how small enough not to disturb the orbit of earth existed close enough to earth that its power could be harnessed to produce huge amounts of energy. This made me wonder if the same concept could be used, except with all the wastes materials on earth. I do not know the exact physics of it all, but from Mr. Hawking explanations it seemed like it might work. Black holes were also explained by Stephen Hawking as how they transcended time. Apparently the massive gravitational pull creates a rip in the space-time continuum. It is unknown what happens to matter when it is pulled into a black time wise. All matter will be ejected into space eventually as the black hole loses itself. The smaller a black hole, the more matter is ejected. It may be an odd happening, but because of the larger black holes are harder to detect than smaller black holes. Mr. Hawking stated of how if an astronaught gets pulled into a black hole the tidal forces would stretch him into a long piece of spaghetti like person. However, his life would not end in the black hole. Given enough time he would be eventually ejected into space as particles. All matter in a black hole will eventually be lost into space. The smaller a black hole is, the more matter is lost by the black hole. Stephen Hawking explained what is thought to have happened to a black hole when all its matter is lost. The hole in the space-time continuum would collapse and an explosion as massive as on of a supernova would happen. It would leave the tear in time. I wondered when the explosion would happen? Would it happen now, or ten to trillions of years from when it actually collapses. The tear in time where would it exist? Until an actual black hole is found close enough to us I suppose these questions will remain uninsured.

A research on the issues of the black urban experience according to steven gregory Essay Example for Free

A research on the issues of the black urban experience according to steven gregory Essay Issues (9) , Gregory (3) company About StudyMoose Contact Careers Help Center Donate a Paper Legal Terms & Conditions Privacy Policy Complaints ? Chapter 5: Race and the Politics of Place Gregory, Steven (1999) Chapter 5: Race and the Politics of Place, in Black Corona , Princeton, NJ:  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   Princeton University Press, 109-138. The researchers conducted this study in order to challenge the depictions of the black urban experience in the media, academics, and public policy debates, which the author does frequently throughout the study. In this portion of the study, Gregory focuses on the struggles that black Lefrak City residents to disrupt the lingering stereotypes alluding to race, crime, and space in everyday politics. To conduct this research, Steven Gregory, an anthropologist, uses ethnography methods including open-ended interviews, participant observation in neighborhoods and political meetings, and archival research to collect the data used in this study. He interviews various residents and political members from this area and attends a meeting involving the Neighborhood Stabilization Committee and Community Board 4. The study takes place in the Corona neighborhood of Queens, New York, specifically in the Lefrak City are home to many African Americans residents as well as people from many other backgrounds. In this study, Gregory points out the struggles that Black Lefrak City residents had in disrupting the lingering stereotypes about, race, crime, and space in everyday politics. He explains how this area of Corona was viewed as a threat to the quality of life in the surrounding areas, which provides a link to urban decline and crime to black welfare dependency (Gregory 111: 1999). He focuses on struggles in the representation of identity and the meaning of place with the distribution of political power. As evidence, Gregory interviews and observes Edna Baskin, an African American woman eager to get involved and create a political organization to counteract these stereotypes and give black citizens from this area representation in the local politics. She establishes the organization called the Concerned Community Adults, where she would help inform residents of neighborhood issues. She faced many struggles in doing this, however, and was said to be â€Å"rubbing against the grain† (Gregory 118: 1999) while trying to promote her organization and get involved with the Community Board, made up of mostly white participants. Gregory talks about other problems this organizations faced, and the successes it achieved later on. This research has strengths in its overall comprehensiveness of the issues that Gregory is discussing. The topic he tries to tackle is very complex, and he does a good job at trying to try to explain the overall issues of the research. However, Gregory could organize his work in a fashion that is easier to comprehend that helps understand the overall concepts and issues he is focusing on in the research. He also only discusses in depth one example of the struggles that one area of this community faces. I believe that it would be interesting to instead compare the many different struggles that different areas of the community have and relate them to one another. It would be interesting to see the similarities and the differences between the different areas of this community. A research on the issues of the black urban experience according to steven gregory. (2018, Apr 13).

Research Paper Example | Topics and Well Written Essays - 1500 words

Research Paper Example 7). The post secondary education offers non-degree programs leading to certificates, diplomas and degree levels. The system does not have a second or higher doctorate, but it offers post doctorate research programs. Because of this complexities and levels, the system has been labelled as an obsolete system that requires innovation. Contentious issues exist on the current organization of levels in the education structure, the K-12 structure. Most American learners especially in literature and arithmetic have accused the education structure of inadequacies that that lead to academic incapability. The chief demonstrators of the existence of academic structure issues lay on incompetence in employment places, as well as the escalating numbers of dropouts. This shows that instructors do not utilize appropriate mechanisms to enhance knowledge comprehension and retention, and techniques that stimulate learners’ interest in academics. This dissertation scrutinizes academic reforms, the various facets that it possesses, and suggested modifications. Relevant instructional material and qualified teachers comprise valuable educational components for education at home or school. This enables students to learn and gain skills and knowledge. They also contribute to the ability of students to compete for economic security through job competition. Adequate education provides students with the tools required for engagement in appropriate civic adult life (Rowan, & Miller, p. 5). The consequences of lacking the educational facilities and components have led to decline in the standards of education. The disparities and inadequacies of instructional material, teachers and facilities, indicate a systemic and deep flaw in the national educational system. These flaws include incoherent and fragmented approach to national policymaking. They also indicate a flawed system of school finance based inequitable distribution of resources. Varied individuals suggest differing solutions t o the problem of academic restructuring in America. Additionally, there have been innumerable transformations of the current structure of American education since commencement. The problem lay with defining the perfect system of organizing and delivering of knowledge in academic institutions. This results to a dilemma because of varied ideologies on educational systems from reformists, as well as scholars. In addition, politicians add to the misunderstanding that surrounds the definition of an ideal structure of education worth implementing. Most politicians voice what they perceive as the anticipation of voters (Futrell, p. 9). They lack an understanding of the reality of the inadequacies in the educational systems, and the requirements for educational reforms. This raises debate on the appropriateness of their ideologies (McClure, Wiener, Roza, & Hill, p. 10). There exists a universal conviction in the global community that education provides an imperative resource that crucial fo r involving in life’s triumphs. Education provides the perseverance to acquire skills and the determination to attain objectives and achieve high standards. It permits individuals to comprehend skills of life and the value of possessing such skill; hence the need to ascertain its attainment. Consequently, creating a competitive, educational structure crucially contributes to the wellbeing of

News Media Comparison Assignment Example | Topics and Well Written Essays - 1000 words

News Media Comparison - Assignment Example o curb the effects of these chemicals on the environment, companies involved in these mining prospects have created lakes where this water is collected and recycled (Bisset, n. p.). Recycling requires extra time and resources, which these companies try to minimize by storing the waste chemicals in lakes. Most of the flow back is pumped into exhausted wells, but it is mostly liked to leach to aquifers and surface waters. Fracking might disrupt radioactive elements and gases that might leach up to the surface and harm people and environment (Dembicki, n. p.). Corporate media like the CTV News’ report that the benefits of natural gas shale mining through the Fracking method’s advantages outweigh the disadvantages. This is in terms of job creation, consistent and steady supply of natural gas for next 100 years, and the income it will generate in terms of savings accrued from expenditure on fuel imports (Bisset, n. p.). The minister, for energy and mines, is quoted advocatin g for natural gas mining using the Fracking process, saying that all it requires is gradual integration of both conservative and avant-garde approaches to both environmental protection and the economic potential of natural gas shale mining (Bisset, n. p.). The framing of the news lays emphasis on the positive impact of the proposed and continued natural gas mining prospects are going to have a long lasting effect on the economies and lives of the people (Krugel, n. p.). This brings to fore the argument that is forwarded by those who are advocating for the continued exploration and mining of natural gas. Their arguments are focused on improving the livelihoods through the creation and acquisition of jobs, and how these mining ventures help in improving the ailing economies of towns and provinces where... This essay approves that alternative media provides complimentary information to that provided by the mainstream media or corporate media. It does this by being different in their delivery of information through varying dimensions of content, models of production, distribution, dynamic artistry and target audience integration. Alternative media’s main objective is to mitigate the effects of existing authorities, like governments and corporations that run the mainstream media, by representing the plight of the marginalized, in society. Although both types of media are bias, alternative media claims that its bias is different from that of corporate media because of their values and overall objective of agitating for the common man’s well being. This paper aims at comparing these two types of media by analysing how they handle a specific current issue in Canada. This report makes a conclusion that the focus on the negative environmental impacts of Fracking, in Canada, is not highlighted as much as it should, but the only mention of the environment is what the government will do, and measures it intends put, in place. There is no mention of what people should do to protect themselves against the harmful effects associated with frack mining. The sources used, in their reporting on this issue, are those that are benefitting from the ongoing mining operations because all their expositions, on the matter, are focused on the positives associated with continued mining activities without focusing on the effects of mining on the environment. Sources from the ministry of environment that would have highlighted the plight of sensitive ecosystems at risk of destruction and its contribution to global warming are not included in their articles.

Water conservation strategies according to green seal requirements Case Study

Water conservation strategies according to green seal requirements - Case Study Example This paper deals with the concept of water recycling and waste water management according to the principles enshrined in Green Seal recommended practices. Water recycling processes can adopt many strategies that strives to conserve water as well as reuse them after separating harmful pollutants and organic matter from it. The strategies also involve practices that encourage the effective use of water and reduction of waste water. Waste water management is not a discipline that merely consists of scientific jargon. It is attainable and sustainable provided one takes the pains to implement it aptly.With the increasing destruction of environmental resources, the need for conservation has significantly increased in the modern world. This is specifically so in the case of resources such as water. Statistics available indicate that sources of potable water will not remain as such if the level of exploitation is to continue at the current rate in the world. In addition to the pressures of p opulation increase and pollution, industrial pressures on potable water are also decreasing the availability of fresh water and there is an urgent need to control water wastage. It is in this context that the need to control water wastage through water recycling gains importance. Wastewater management is an emerging field of science that helps to tackle issues related to water pollution and contamination in the industrial world.The need for waste water management has many ramifications, which is both social as well as economical. As far as the society is concerned waste water management helps to recycle the much needed elixir of life back into the water sources as potable water. Otherwise, water that is recycled can be used to sustain green cover over an area thereby providing for the optimum use of this precious natural resource. On the economic front it may be said that conserving water amounts to saving money in many ways and the initial costs that may be involved can soon be rec ouped in terms of both tangible and intangible benefits for the company. World wide statistics indicate that water, which is a fundamental need for the existence of life on earth, is limited in terms of its availability. Humans have access to less than 0.08% of all the water that is available in earth. To add to the woes it is believed the need for water will increase by about 40% in the next two decades. This perhaps indicates to the immense responsibility that humans have towards conserving water. In the year 1999, the United Nations Environment Programme identified water shortage as one of the two most worrying problems for the millennium. The fact that the other problem, global warming, is also related to water shortage adds gravity to the situation. It is believed that one person in five across the world has no access to safe drinking water. Similarly, one in two lacks safe sanitation [United Nations Industrial Development Organization. 1996] In terms of social ramifications, a reliable supply of water is the basic need for any form of development. The availability and quality of water is essential factor in the nation's ability to protect public health, preserve ecological integrity, ensure sufficient agricultural production, and meet commercial needs. Therefore issues affecting the nation's atmospheric water, surface water and groundwater need to be addressed with priority. Certain facts that point towards the gravity of a water crisis are: About 1.1 billion people, or 18 percent of the world's population, lack access to safe drinking water. In addition, 2.5 billion are without proper sanitation. Even though the freshwater supplies are sufficient for the world's population, water scarcity exists due to poor management and distribution of water resources. Unsafe drinking water is the cause of death of more than five million people each year.