A fitness center is interested in finding a 95% confidence interval for the mean number of daysper week that Americans who are members of a fitness club go to their fitness center. Records of248 members were looked at and their mean number of visits per week was 3.1 and the standarddeviation was 2.8. Round answers to 3 decimal places where possible.a. With 95% confidence the population mean number of visits per week is betweenandvisits.b. If many groups of 248 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.

Givensample size(n)=248Mean(x)=3.1standard deviation(s)=2.8

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. What's the standard deviation for data set 1. B. What's the standard deviation for data set 2. C. What's the standard deviation for data set 3.
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Please answer the following three multiple choice questions :) Summarized below are data for a study to see if hours of sleep per day for med and non-med students are the same: n x¯ s med students 25 5.8 0.83 non-med students 32 6.3 1.39 1. Find the test statistic (assume unequal standard deviation) A. -15.44 B. -5.69 C. -1.69 D. -1.81 2. Let tstat represent the value of the test statistic from the previous question. The degrees of freedom for the test are df = 52. To test the claim that the mean hours of sleep for med and non-med students is different, the P-value is calculated as: A. 2*pt( tstat, df=52, lower.tail = TRUE) B. 2*pt( tstat, df=52, lower.tail = FALSE) C. pt( tstat, df=52, lower.tail = TRUE) D. pt( tstat, df=52, lower.tail = FALSE) 3. The correct P-value is 0.098. At α = 0.05, we A. reject H0. The claim that means are different is not supported. B. reject H0. The claim that means are different is supported. C. fail to reject…

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