Wall Street Journal reported on several studies that show massage therapy has a variety of healthbenefits and it is not too expensive. A sample of 10 typical one-hour massage therapy sessionsshowed an average charge of $59. The population standard deviation for a one-hour session iso = $5.45.a. What assumptions about the population should we be willing to make if a margin of error is desired?The population is at least approximately normal is requiredb. Using 95% confidence, what is the margin of error (to 2 decimals)?c. Using 99% confidence, what is the margin of error (to 2 decimals)?

Given n=Sample size=10 X=Mean=59 σ=Standard deviation=5.45

Answered: Wall Street Journal reported on several…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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A study that looked at beverage consumption used sample sizes that were much smaller than previous national surveys. One part of this study compared 20 children who were 7 to 10 years old with 5 who were 11 to 13. The younger children consumed an average of 8.5 oz of sweetened drinks per day while the older ones averaged 14.5 oz. The standard deviations were 10.9 oz and 8.5 oz respectively.Use younger children as population 1. (a) Do you think that it is reasonable to assume that these data are Normally distributed? Explain why or why not. (Hint: Think about the 68-95-99.7 rule.) O The distributions appear to be Normal according to the 68-95-99.7 rule. We can see that the groups have means and standard deviations, two characteristics of Normal distributions. O The 68-95-99.7 rule suggests that the distributions are not Normal. If they were, we would expect some of the children to drink negative amounts of sweetened drinks, which does not make sense. (b) Using the methods in this…
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You want to buy a washing machine, and a salesperson tells you that the mean repair costs for Model A and Model B are equal. You research the repair costs. The mean repair cost of 29 Model A washing machines is $211. Assume the population standard deviation is $15. The mean repair cost of 26 Model B washing machines is $216. Assume the population standard deviation is $25. At a = 0.01, can you reject the salesperson's claim? Assume the samples are random and independent, and the populations are normally distributed. Complete parts (a) through (e). O A The mean repair cost for Model A is greater than Model B B. The mean repair costs for Model A and Model B are equal. O C. The mean repair cost for Model A is less than Model B O D. The mean repair costs for Model A and Model B are different. Let u, be the mean repair cost for Model A and let u, be the mean repair cost for Model B. What are Ho and H,? O B. Ho: H1 =H2 Hai H1 # H2 O E. Ho: H1 # H2 OC. Ho: H1 SH2 Hai H1>H2 OF. Ho: H1ZH2 Ha:…
You may need to use the appropriate appendix table or technology to answer this question. Studies show that massage therapy has a variety of health benefits and it is not too expensive. A sample of 14 typical one-hour massage therapy sessions showed an average charge of $58. The population standard deviation for a one-hour session is = $4.5. (a) What assumptions about the population should we be willing to make if a margin of error is desired? O We should be willing to make the assumption that the population is at least approximately normal. O we should be willing to make the assumption that the population is at least approximately skewed right. O We should be willing to make the assumption that the population is at least approximately skewed left. O we should be willing to make the assumption that the population is at least approximately uniform. O we should be willing to make the assumption that the population is at least approximately bimodal. (b) Using 95% confidence, what is the…
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