Question 3Assume the average teenager sends 250 text messages per day. You sample 28 localteenagers and find that they send 232 messages per day with a standard deviation(calculated with the correction) of 64 messages per day. What decision would youmake based on these data?Fail to reject the null hypothesis; we cannot conclude that there is any differencebetween our sample and the nation.Fail to reject the null hypothesis; the local teenagers text more than the nationalaverage.Reject the null hypothesis; there is no evidence of a difference between oursample and the nation.Reject the null hypothesis; our sample sends significantly fewer text messagesthan the national average.

Answered: Image /qna-images/answer/f2c7fd69-885e-45e3-a879-7d46a0142f46.jpg

Answered: Assume the average teenager sends 250…

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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7.) In a study of the accuracy of fast food drive through orders, based on data from QSR Magazine,Burger King had 264 accurate orders and 54 orders than were not accurate.a.) Construct a 99% confidence interval estimate of the proportion of orders that were not accurate.b.) A similar study of orders at Wendy’s led to a 99% confidence interval estimate of the proportion oforders that were not accurate of: 6.2% < p < 15.9%Comparing that interval with the interval that you constructed, could you definitively conclude that onerestaurant has a significantly better rate of accuracy of orders than the other? Why or why not?
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