Arithmetic Mean and Five-step P-value Approach Essay Example for Free

Arithmetic Mean and Five-step P-value Approach Essay A manufacturer of chocolate candies uses machines to package candies as they move along a filling line. Although the packages are labeled as 8 ounces, the company wants the packages to contain a mean of 8. 17 ounces so that virtually none of the packages contain less than 8 ounces. A sample of 50 packages is selected periodically, and the packaging process is stopped if there is evidence that the mean amount packaged is different from 8. 17 ounces. Suppose that in a particular of 50 packages, the mean amount dispensed is 8. 159 ounces, with a sample standard deviation of 0. 051 A. Is there evidence that the population mean amount is different from 8. 17 ounces? (Use a 0. 05 level of significance. ) B. Determine the p-value and interpret its meaning. 9. 27 In New York State, savings banks are permitted to sell a form of life insurance called savings bank life insurance (SLBI). The approval process consists of underwriting, which includes a review of the application, a medical information bureau check, possible requests for additional medical information and medical exams, and a policy complication stage in which the policy pages are generated and sent to the bank for delivery. The ability to deliver approved policies to customers in a timely manner is critical to the profitability of this service. During a period of one month, a random sample of 27 approved policies is selected, and the total processing time, in days, is recorded (and stored in insurance): 73 19 16 28 31 56 45 17 22 18 91 92 50 51 69 A. In the past, the mean processing time was 45 days. At the 0. 05 level of significance, is there evidence that the mean processing time had changed from 45 days? B. What assumption about the population distribution is needed in order to conduct the t test in (a)? C. Construct a boxplot or a normal probability plot to evaluate the assumption made in (b). D. Do you think that the assumption needed in order to conduct the t test in (a) is valid? Explain. 93. 1 One operation of a steel mill is to cut pieces of steel into parts that are used in the same frame for front seats in an automobile. The steel is cut with a diamond saw and requires the resulting parts must be cut within ? ± 0. 005 inch of the length specified by the automobile company. The file Steel contains a sample of 100 steel parts. The measurement reported is the difference, in inches, between the actual length of the teel part, as measured by a laser measurement device, and the specified length of the steel part. For example, a value of -0. 002 represents a steel part that is 0. 002 inch shorter than the specified length. A. At the 0. 05 level of significance, is there evidence that the mean difference is not equal to 0. 0 inches? B. Construct a 95% confidence interval estimate of the population mean, Interpret this interval. C. Compare the conclusions reached in (a) and (b). D. Because n= 100, do you have to be concerned about the normally assumption needed for the t test and t interval? 9. 45 In recent year, the Federal Communications Commission reported that the mean wait for repairs for ATT customers was 25. 3 hours. In an effort to improve this service, suppose that a new repair service process was developed. This new process, used for a sample of 100 repairs, resulted in a sample mean of 22. 3 hours and a sample standard deviation of 8. 3 hours. A. Is there evidence that the population mean amount is less than 25. 3 hours? (Use a 0. 05 level of significance. ) B. Determine the p- value and interpret its meaning. 9. 47 You are the manager ot a restaurant that delivers pizza to college dormitory rooms. You have Just changed your delivery process in an effort to reduce the mean time between the order and completion of delivery from the current 25 minutes. A sample mean of 22. 4 minutes and a sample standard deviation of 6 minutes. A. Using the six- step critical value approach, at the 0. 05 level of significance, is there evidence that the population mean delivery time value of 25 minutes? B. At the 0. 05 level of significance, use the five-step p-value approach? C. Interpret the meaning of the p- value in (b). D. Compare your conclusions in (a) and (b). 9. 53 The U. S. Department of Education reports that 46% of full-time college students are employed while attending college (data extracted from The Condition of Education 2009, National Center for Education Statistics, nces. ed. gov). A recent survey of 60 full-time students at Miami University found that 29 were employed. A. Use the five- step p-value approach to hypothesis testing and a 0. 05 level of significance to determine whether the proportion of full-time students at Miami University is different that the national norm of 0. 6. B. Assume that the study found that 36 of the 60 full-time students were employed and repeat (a). Are the conclusions the same? 9. 55 One of the issues facing organizations is increasing diversity throughout the organization. One of the ways to evaluate an organizations success at increasing diversity is to compare the percentage of employees in the organization in a particular position with a specific background to the percentage in a position with that specific background in the general workforce. Recently, a large academic medical center determined that 9 of 17 employees in a particular position were female, whereas 55% of the employees for this position in the general workforce were female. At the 0. 05 level of significance, is there evidence that the proportion of females in this position at this medical center is different from what would be expected in the general workforce? 9. 57 One of the biggest issues facing e-retailers is the ability to reduce the proportion of customers who cancel their transaction after they have selected their products. It has been estimated that about half of prospective customers cancel their transactions after they have selected their products (data extracted from B. Tedeschi, E- Commerce, a Cure for Abandoned Shopping Carts: A Web Checkout System That Eliminates the Need for Multiple Screens, The New York Times, February 14, 2005, p. C3). Suppose that a company changed its Web site so that customers could use a single page checkout process rather than multiple pages. A sample of 500 customers who had selected their products were provided with the new checkout system.

Changes in Soil Physical, Chemical, and Biological Properties Caused by

Changes in Soil Physical, Chemical, and Biological Properties Caused by Artificial Drainage of Wetlands Wetland soils are extremely varied. They are found from the tropics to the subarctic. They can be seasonal or year-round, freshwater or saltwater, organic or mineral. The one thing that all of them have in common is that for at least part of the year they are saturated with water. This saturation has a significant impact on the soil's physics, chemistry, and biota. However, over the past century more than half of all the wetlands in the United States has been drained for agriculture and other uses such as construction. When the soils are drained the physics, chemistry, and biota are drastically changed. This paper is an attempt to describe the changes in artificially drained soils and to consider a few of the consequences of these changes. The physical properties of saturated soils vary somewhat from wetland to wetland but are characterized by certain processes. One is the interaction of the soil with the watertable. Three patterns of possible groundwater flow have been considered: water could flow into the saturated areas from the surrounding area (discharge), making the saturated area the focal point; water could flow through swamps because of local relief (flow-through); or water could flow from the saturated zone into surrounding areas (recharge) possibly due to differential water use by plant communities or pumping (Crownover et al, p. 1199). There can also be vertical exchange of water between the groundwater and saturated soil. For example, capillary effects pull water upward into the soil from the water table. Besides the vertical and horizontal flow of water, the area of the soil taken up by water is important.... ...ater flow patterns through a cypress swamp-pine flatwood landscape: Soil Science Society of America Journal, 59, p. 1199-1206. Fausey, N.R., Brown, L.C., Belcher, H.W. and Kanwar, R.S., 1995, Drainage and water quality in the Great Lakes and cornbelt states: Journal of Irrigation Drainage Engineering, 121, p.283-288. Leventhal, E., 1990, Alternative uses of wetlands other than conventional farming in Iowa, Kansas, Missouri, and Nebraska: EPA/171/R-92/006, 145 p. McBride, M. B., 1994, Environmental Chemistry of Soils: New York, Oxford University Press, 406 p. Mitsch, W.J. and Gosselink, J.G., Wetlands: New York, Van Nostrand Reinhold Company, 537 p. Schipper, L.A., Harfoot, C.G., McFarlane, P.N., and Cooper, A.B., Anaerobic decomposition and denitrification during plant decomposition in an organic soil: Journal of Environmental Quality, 23, p. 923-928.

High school education Essay

We can all say education is a big requisite in life, but do we really spend the appropriate time to it? . We sure not†¦, at least I didn’t for a couple of years. Freshman year on high school could be hat year you would never forget. Becomes a new life style, met new people, new hobbies, and new interests. Basically turns out to your biggest change in life. My high school education could of say it was more fun and adventurous than those kids who actually are focus to graduate with a high GPA, get an efficient scholarship, and attend to a reputable university. I started out my freshman year good. I was attending to class, participating and doing class work, I was doing homework. I had no problems, then after my freshman year was over I had many friends that I was expected. Then I got to meet my true friends which I still hang out and do crazy stuff. My sophomore and junior year I went out of control laterally. I never was in school, just to go get my free lunch because, who didn’t liked to be in lunch? Right. To be clearer, anywhere was a better place than school. Yeah I had so much fun, memories than I would never forget, unexpected trips, water balloons fights, ride horsing, and four wheeling, ditching parties, even run away from cops. But like how it needed to happened, it happened. My slacking in grades would be known eventually by my mom. There’s one thing that I’ll be always glad for, I have the most overprotective mom in the world. Her reaction was immediately that the next day she knew about I was not going to school, she was there talking to the principle asking him to make a stop of it. All the trouble that I was into, and all the talks my mom and I had, it made my mind expand to reality and to convince myself that I was not doing good in school and that would affect my future. I catch up my senior year picking up my GPA and grades to proudly get thehigh school education and be able to register at CNM. College is a different level than high school by too much. Here you cannot take the risk to slack not even a little. If you slack not showing up, or not turning homework, grades are really affected. College has help me to raise myself as an adult and take proprieties first. That you are who build your future, that hard work always pays off. I’m thankful to attend to college.

Globalisation and China’s Environmental Problems Essay

Is the lifestyle of people in Europe and the USA a major cause of China’s environmental problems? One of China’s best successes has in turn been one of its biggest downfalls. One of the main problems is China’s greatest success which has been its phenomenal economic growth. This is one of the main drivers of the current environmental problems that the country faces. Factories dump pollutants into the air and water. It is difficult to see the Chinese government making the significant sacrifices required to improve their environment if it means slowing down their economic growth. In order to understand why China is in such environmental difficulties we need to understand why the lifestyles of people in Europe and the US could be to†¦show more content†¦These two areas are a result of increased industrialisation to keep up with the rapid growth in Chinas export. One major external driver is outside influences such as the US, by the demanding lower products and goods, manufacturers are forced to reduce any environmental safeguards that they had in place. An example of this is when a textiles mill in southern China was caught dumping 22,000 tons of contaminated water from its dyeing operation each day turning the whole river dark red. Another driver behind behaviour such as this is the ever growing discount clothing chain stores. Prices on fabric and clothing have fallen by 25% since 1995 and the particular article this was taken from was put together back in 2007. The discount clothing giants have become even more cut throat and competitive over t he last few years. This behaviour is what has made China a huge export giant but has cost them so much more. The inflated prices you may pay elsewhere take into consideration the cost of manufacturing and all the other associated costs in production and safe removal of industrial waste. From China a great deal of the time you are paying simply for the product or service and not to cover the costs of environmental safeguard. By 2006 there were 6000 registered environmental groups in China. They are growing in numbers, influence and assertiveness. These groups are made up of people that are now beginning to understand the consequences of rapid growth andShow MoreRelatedï » ¿Discuss the impact of globalisation on China, with reference to economic development and environmental consequences1356 Words   |  6 Pagesï » ¿Discuss the impact of globalisation on China, with reference to economic development and environmental consequences Globalisation, is the process of increasing integration among different countries, resulting in the establishment of a single world market. 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