9. The results from a sample of 175 JAC students found the average number of YouTube videoswatched per day was 6.2. A previous census showed that the standard deviation was 1.74.l. Calculate the 98% confidence interval to estimate the average number of YouTube videos watchedper day for the entire JAC population.b. What would happen to the interval range if the level of confidence was increased from 98% to99.9%? NOTE: you do not need to do the calculation (you just need to explain what happens).

Answered: Image /qna-images/answer/d14680ca-b1d1-46aa-bd83-a23f04613820.jpg

Answered: 9, The results from a sample of 175 JAC…

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 random sample of 64 shoppers showed that they spend an average of $27.31 per visit at the Sunday Mornings Bookstore. The standard deviation of the population is $2.14. Find the 90% confidence interval of the true mean. Please include all work showing how you found your answer.
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The mayor is interested in finding a 90% confidence interval for the mean number of pounds of trash per person per week that is generated in the city. The study included 185 residents whose mean number of pounds of trash generated per person per week was 34.3 pounds and the standard deviation was 6.4 pounds. Round answers to 3 decimal places where possible. a. With 90% confidence the population mean number of pounds per person per week is between and pounds. b. If many groups of 185 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 pounds of trash generated per person per week and about percent will not contain the true population mean number of pounds of trash generated per person per week.

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