Stats
5th Edition
ISBN: 9780135163825
Author: De Veaux, Richard D., Velleman, Paul F., BOCK, David E.
Publisher: Pearson,
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Chapter 6, Problem 29E
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4.96 The breaking strengths for 1-foot-square samples of a particular synthetic fabric are approximately normally distributed with a mean of 2,250 pounds per square inch (psi) and a standard deviation of 10.2 psi. Find the probability of selecting a 1-foot-square sample of material at random that on testing would have a breaking strength in excess of 2,265 psi.4.97 Refer to Exercise 4.96. Suppose that a new synthetic fabric has been developed that may have a different mean breaking strength. A random sample of 15 1-foot sections is obtained, and each section is tested for breaking strength. If we assume that the population standard deviation for the new fabric is identical to that for the old fabric, describe the sampling distribution forybased on random samples of 15 1-foot sections of new fabric
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Test d'égalité des espérances: observations pairées
A television news channel samples 25 gas stations from its local area and uses the results to estimate the average gas price for the state. What’s wrong with its margin of error?
Chapter 6 Solutions
Stats
Ch. 6.2 - Your statistics instructor tells you that the...Ch. 6.2 - Prob. 2JCCh. 6.2 - Prob. 3JCCh. 6.2 - Prob. 4JCCh. 6.2 - Prob. 5JCCh. 6 - Prob. 1ECh. 6 - 2. Association II Suppose you were to collect data...Ch. 6 - 3. Bookstore sales Consider the following data...Ch. 6 - 4. Disk drives 2016 Disk drives have been getting...Ch. 6 - 5. Correlation facts If we assume that the...
Ch. 6 - 6. Correlation facts II If we assume that the...Ch. 6 - Prob. 7ECh. 6 - 8. Blizzards A study finds that during blizzards,...Ch. 6 - Prob. 9ECh. 6 - Prob. 10ECh. 6 - Prob. 11ECh. 6 - Prob. 12ECh. 6 - Prob. 13ECh. 6 - 14. Scatterplots II Which of these scatterplots...Ch. 6 - Prob. 15ECh. 6 - Prob. 16ECh. 6 - Prob. 17ECh. 6 - Prob. 18ECh. 6 - 19. Matching Here are several scatterplots. The...Ch. 6 - 20. Matching II Here are several scatterplots. The...Ch. 6 - Prob. 21ECh. 6 - 22. Car thefts The National Insurance Crime Bureau...Ch. 6 - Prob. 23ECh. 6 - 24. Antidepressants A study compared the...Ch. 6 - Prob. 25ECh. 6 - Prob. 26ECh. 6 - Prob. 27ECh. 6 - Prob. 28ECh. 6 - Prob. 29ECh. 6 - Prob. 30ECh. 6 - Prob. 31ECh. 6 - Prob. 32ECh. 6 - Prob. 33ECh. 6 - Prob. 34ECh. 6 - Prob. 35ECh. 6 - Prob. 36ECh. 6 - Prob. 37ECh. 6 - 38. Sample survey A polling organization is...Ch. 6 - Income and housing The Office of Federal Housing...Ch. 6 - Interest rates and mortgages 2015 Since 1985,...Ch. 6 - Prob. 41ECh. 6 - Prob. 42ECh. 6 - Burgers Fast food is often considered unhealthy...Ch. 6 - Prob. 44ECh. 6 - Prob. 45ECh. 6 - Prob. 46ECh. 6 - Prob. 47ECh. 6 - Prob. 48ECh. 6 - Prob. 49ECh. 6 - Prob. 50ECh. 6 - Prob. 51ECh. 6 - Prob. 52ECh. 6 - Prob. 53E
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- Suppose that you conduct a study twice, and the second time you use four times as many people as you did the first time. How does the change affect your margin of error? (Assume the other components remain constant.)arrow_forwardOut of a sample of 200 babysitters, 70 percent are girls, and 30 percent are guys. What’s the margin of error for the percentage of female babysitters? Assume 95 percent confidence.What’s the margin of error for the percentage of male babysitters? Assume 95 percent confidence.arrow_forwardYou sample 100 fish in Pond A at the fish hatchery and find that they average 5.5 inches with a standard deviation of 1 inch. Your sample of 100 fish from Pond B has the same mean, but the standard deviation is 2 inches. How do the margins of error compare? (Assume the confidence levels are the same.)arrow_forward
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