Population Standard Deviation free essay sample

REVIEW EXERCISES CHAPTER 8 AND 9 PROFESSOR JONAS WIU-RES BY DEBRA JAMES CHAPTER 8 1. High temperature in the United States a meteorologist claims that the average of the highest temperatures in the united states in 98. A random sample of 50 cities is selected, and the highest temperatures are recorded. The data are shown. At a=0. 05 can the claim be rejected? a=7. 7 97, 101, 99, 99, 100, 94, 87, 99, 108, 93, 96, 88, 98, 97,88, 105, 97, 96, 98, 102, 99, 94, 96, 114, 99, 96, 98, 97, 91, 98, 80, 95, 98, 96, 80, 95, 88, 99, 102, 95, 101, 94, 92, 99, 101, 97, 94, 97, 102, 61. The claim can be rejected; correct answer may be either above 98 or below it. 2. Salaries for Actuaries nationwide graduates entering the actuarial field earn $40,000. A college placement officer feels that this number is too low. She surveys 36 graduates entering the actuarial field and finds the average salary to be $41,000. The population standard deviation is $3000. Can her claim be supported at 0. 05? x? =14. 7, ? x? =13. 77, ox? =5. 34, n=29, ? =. 01 3. Monthly Home Rent. The average monthly rent for a one bedroom in San Francisco is $ 1229. A random sample of 15 one bedroom homes about 15 miles outside of San Francisco had a mean rent of 50. We will write a custom essay sample on Population Standard Deviation or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page The population standard deviation is $250. At a=0. 05 can we conclude that the monthly rent outside San Francisco differs from that in the city? 4. 5. Federal Prison Populations nationally 60. 2% of federal prisons are severing time for drug offenses. A warden feels that in his prisons the percentage is even higher. He surveys 400 inmates records and finds that 260 of the inmates are drug offenders at a=0. 5 is this correct? CHAPTER 9 1. Driving for pleasure two groups of drivers is surveyed to see how many miles per week they drive for pleasure trips. The data are shown at a=0. 01 can it be conducted that single drivers do more driving for pleasure trips on average than married drivers? Assume =16. 7 and =16. 1 Level of significance a = 0. 05, we reject the null hypothesis. This means there is a significant difference between There is not sufficient evidence to conclude. 2. Communication times according to the bureau of labor statistics American time use survey married persons spend an average of 8 minutes per day on phones calls, mail and email, while single persons spend an average of 14 minutes per day on these same tasks. Based on the following information is there sufficient evidence to conclude that single persons spend, on average a greater time each day communicating? Use the 0. 05 level of significance. There is not enough information to actual average salary. In each of the following At the 0. 05 level, does this show sufficient evidence to conclude . Teachers’ Salaries a sample of 15 teachers from Rhode Island has an average salary of $35,270, with a standard deviation of $3256. A sample of 30 teachers from New York has an average salary of $29,512, with a standard deviation of $ 1431. Is there a significant difference in teachers’ salaries between the two states? Use a = 0. 02. Find the 98% confidence interval for the diffe rence of the two means. H0: ? 1 ? 2 = 3000 H1: ? 1 ? 2 ? 3000 where, H0 is the null hypothesis, d = 3000 For hypothesis testing on two means with known variances: ? = [(X1 X2) d] / {v[ (? 1? n1) + (? 2? / n2) ] } where, X1 and X2 are the two sample means ?1 and ? 2 are the two sample standard deviations n1 and n2 are the two sample sizes In this case, X1 = 35,270 X2 = 29,512 ?1 = 3,256 ?2 = 1,432 n1 = 36 n2 = 49 d = 3,000 Plug these values into the above equation to obtain: ? = 4. 756 For a significance level of 2. 5% (i. e. 0. 025), Z = 2. 24 Since ? Z at the 2. 5% significance level, the null hypothesis is rejected meaning that the data does not support the idea that a Rhode Island Teachers mean salary is $3,000 more than a New York Teachers mean salary. . High and Low Temperatures – March is a month of variable weather in the northeast. The chart below records the actual high and low temperatures for a selection of days in March from the weather reports for Pittsburgh Pennsylvania. At the 0. 01 level of significance is there sufficient evidence to conclude that there is more than a 10% difference between average highs and lows? Professor Jonas, I have not had a good time with this assignment, it is very hard working with one hand.

The History and Legacy of Project Mercury

The History and Legacy of Project Mercury For people who were living in the 1950s and 1960s, the Space Race was an exciting time when people were venturing out from Earths surface and heading to the Moon, and hopefully beyond. It officially began when the Soviet Union beat the U.S. into space with the Sputnik mission in 1957 and with the first man into orbit in 1961. The U.S. scrambled to catch up, and the first human crews went to space as part of the Mercury program. The program goals were fairly simple, although the missions were quite challenging. Mission aims were to orbit a person in a spacecraft around Earth,  investigate a humans ability to function in space, and to recover both astronaut and spacecraft safely. It was a formidable challenge and it affected the scientific, technological, and educational establishments of both the U.S. and the Soviets. The Origins of Space Travel and the Mercury Program While the Space Race got started in 1957, it had roots much earlier in history. No one is exactly sure when humans first dreamed of space travel. Perhaps it began when  Johannes Kepler  wrote and published his  book Somnium. However, it wasnt until the middle of the 20th century that technology developed to the point where people could actually transform ideas about flight and rockets into hardware to achieve space flight. Initiated in 1958, completed in 1963, Project Mercury became the United Statess first man-in-space program. Creating the Mercury Missions After setting goals for the project, the newly formed NASA adopted guidelines for the technology that would be used in the space launch systems and crew capsules. The agency mandated that (wherever it was practical), existing technology and off-the-shelf equipment should be used. Engineers were required to take the simplest and most reliable approaches to system design. This meant that existing rockets would be used to take the capsules into orbit. Those rockets were based on captured designs from the Germans, who had designed and deployed them during World War II.   Finally, the agency set up a progressive and logical test program for the missions. The spacecraft had to be built tough enough to withstand a great deal of wear and tear during launch, flight, and return. It also had to have a reliable launch-escape system to separate the spacecraft and its crew from the launch vehicle in case of impending failure. This meant that the pilot had to have manual control of the craft, the spacecraft had to have a retrorocket system capable of reliably providing the necessary impulse to bring the spacecraft out of orbit, and its design would allow it to use drag braking for re-entry. The spacecraft also had to be able to withstand a water landing because, unlike the Russians, NASA planned to splash its capsules down in the ocean.   Although most of this was accomplished with off-the-shelf equipment or through the direct application of existing technology, two new technologies had to be developed. Those were an automatic blood-pressure measuring system for use in flight, and instruments to sense the partial pressures of oxygen and carbon dioxide in the oxygen atmosphere of the cabin and space suits. Mercurys Astronauts The Mercury program leaders decided that the military services would provide the pilots for this new endeavor. After screening more than 500 service records of test and fighter pilots in early 1959, 110 men were found that met the minimum standards. By the middle of April Americas first seven astronauts were selected, and they became known as the Mercury 7. They were Scott Carpenter,  L. Gordon Cooper,  John H. Glenn Jr.,  Virgil I. Gus Grissom,  Walter H. Wally Schirra Jr.,  Alan B. Shepard Jr., and  Donald K. Deke Slayton The Mercury Missions The Mercury Project consisted of several unmanned test missions as well as a number of missions taking pilots into space. The first one to fly was Freedom  7, carrying Alan B. Shepard into a suborbital flight,on May 5, 1961. He was followed by Virgil Grissom, who piloted the Liberty Bell 7 into a suborbital flight on July 21, 1961. The next Mercury mission flew on February 20, 1962, carrying John Glenn into a three-orbit flight aboard Friendship 7.  Following Glenns historic flight, astronaut Scott Carpenter rode Aurora 7 into orbit on May 24, 1962, followed by Wally Schirra aboard Sigma 7 on October 3, 1962. Schirras mission lasted six orbits. The final Mercury mission took Gordon Cooper into a 22-orbit track around Earth aboard Faith 7 on May 15-16, 1963. At the end of the Mercury era, with its technology proven, NASA prepared to move forward with the Gemini missions. These were planned as preparation for the Apollo missions to the Moon. The astronauts and ground teams for the Mercury missions proved that people could fly safely to space and return, and laid the groundwork for much of the technology and mission practices followed by NASA to this day.   Edited and updated by Carolyn Collins Petersen.

Debates on obamacare Term Paper Example | Topics and Well Written Essays - 1250 words

Debates on obamacare - Term Paper Example According to this act, approximately 44 million Americans are currently unable to access health insurance. The aim of Obama care is to help this people get health insurance by expanding Medicare and Medicaid. From this sense, the Universal Declaration of Human Rights is the motivational factor behind this document and not the American Constitution (Pipes 29). The Act established that every citizen has a right to Health Care as a public good, not an asset and thus the U.S health care system must aim at fulfilling the following principles. Universality where each American has the human right to access health care and accountability as the first priority in the responsibilities of the U.S government. Equity, which provides that all the benefits and contributions be distributed fairly to develop a system that favors everyone (Pipes 45). Reasoned arguments for government programs to ensure that everyone has access to affordable health care Utilitarianism provides that promotion of welfare is  the most important, and that the society should be organized in such a way that would best obtain individuals' well being. It justifies the huge redistribution of wealth to the poor. Futilitarians do not consider historical facts to be important, but their influence on justice verdicts are derived purely from what the future holds for people. Utilitarianism gives equal weight to the interests of each individual, so that burdens may be placed on the one with greater benefits. To shy away from this fact is to give more priority to the lesser important issues at the expense of the greater ones, which is to treat the former citizen's interests as more essential as compared to the latter's. To them, justice calls for equal concern for everyone, which in turn requires the kind of weighing and balancing between a life’s applied by the prudent person in accepting a current cost for the sake of a greater, future benefit (Pipes 48-9). From a utilitarian view, Obama care is a ben eficial policy since it is an improvement of earlier laws and it is aimed at increasing the total utility and happiness in the state. In earlier years, the American government did not provide that insurance companies justify the rise in prices, which was a huge opportunity for private companies to exploit citizens and charge very high premiums for insurance policies. The new law of Obama care will ensure that the government implements its "exchange option," subsidize health insurance for a number of them, and require insurance companies to announce publicly and justify any increases to premiums of over ten percent. This will enable a closer look into the operations of the actions of a company, leading to reasonable prices and a higher quality of health care providers. Apart from decreasing the prices, Obama care will offer more extensive and accessible Medicare and health care to those people who could not afford it in prior times. If health care is made available to many people, th en there will be a possibility of regular health care that will bring about happiness and utility. As much as a libertarian would consider that Obamacare restrict the freedom of American citizens and thus is no better than the earlier law, which put forward that the unhappiness of the minority would