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A social media analyst wanted to know the average number of Facebook friends that young people of ages 13-16 have. She took a random sample of 100 children of ages 13-16 years old and found out that the average number of friends they have is x ̅ = 120 with a population standard deviation of σ = 12.4. Use 95% confidence interval for the mean number of friends of all Facebook users of ages 13-16 Based on the problem above, what is α/2 (alpha/2)?  What is its Zα/2? Based on the problem, what is its margin of error? What is its confidence interval?

A social media analyst wanted to know the average number of Facebook friends that young people of ages 13-16 have. She took a random sample of 100 children of ages 13-16 years old and found out that the average number of friends they have is x ̅ = 120 with a population standard deviation of σ = 12.4. Use 95% confidence interval for the mean number of friends of all Facebook users of ages 13-16 Based on the problem above, what is α/2 (alpha/2)?  What is its Zα/2? Based on the problem, what is its margin of error? What is its confidence interval?

MATLAB: An Introduction with Applications
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 social media analyst wanted to know the average number of Facebook friends that young people of ages 13-16 have. She took a random sample of 100 children of ages 13-16 years old and found out that the average number of friends they have is x ̅ = 120 with a population standard deviation of σ = 12.4. Use 95% confidence interval for the mean number of friends of all Facebook users of ages 13-16

Based on the problem above, what is α/2 (alpha/2)? 
What is its Zα/2?
Based on the problem, what is its margin of error?
What is its confidence interval?

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