A fitness center is interested in finding a 90% confidence interval for the mean number of daysper week that Americans who are members of a fitness club go to their fitness center. Records of239 members were looked at and their mean number of visits per week was 3.3 and the standarddeviation was 2.6. Round answers to 3 decimal places where possible.a. To compute the confidence interval use a z v distribution.b. With 90% confidence the population mean number of visits per week is betweenandvisits.c. If many groups of 239 randomly selected members are studied, then a different confidenceinterval would be produced from each group. Aboutpercent of these confidenceintervals will contain the true population mean number of visits per week and aboutpercent will not contain the true population mean number of visits per week.Hint: Hints LVideo [+]

Givensample size(n)=239Mean(x)=3.3standard deviation(s)=2.6confidence interval = 90%

Answered: A fitness center is interested in…

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 fitness center is interested in finding a 98% confidence interval for the mean number of days per week that Americans who are members of a fitness club go to their fitness center. Records of 268 members were looked at and their mean number of visits per week was 2.1 and the standard deviation was 2.9. a. To compute the confidence interval use a ? distribution. b. With 98% confidence the population mean number of visits per week is between visits. and c. If many groups of 268 randomly selected members are studied, then a different confidence interval would be produced from each group. About percent of these confidence intervals will contain the true population mean number of visits per week and about percent will not contain the true population mean number of visits per week.
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3 see picture
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