Answered: At = α 0.05 , is there sufficient…

Math

Statistics

At = α 0.05 , is there sufficient evidence to conclude that the mean number of friends is greater than 140 ?

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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Question

Many people believe that the average number of Facebook friends is
140

. The population standard deviation is
38.8

. A random sample of
33

high school students in a particular county revealed that the average number of Facebook friends was
156

. At
=
α
0.05

, is there sufficient evidence to conclude that the mean number of friends is greater than
140

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