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ported in June 2011. 23-35 36-49 50-65 65+ 312 253 195 59 ion that users are equally likely

ported in June 2011. 23-35 36-49 50-65 65+ 312 253 195 59 ion that users are equally likely

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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4. Between 2008 and 2011, the age distribution of users of social networking sites such as Facebook changed dramatically. In 2008, 70% of users were 35 years old or younger. In 2011, the age distribution was much more spread out. The table below shows the age distribution of 975 users of social networking sites from a survey reported in June 2011. 36-49 Age Frequency 18-22 23-35 50-65 65+ 156 312 253 195 59 (a) Test an assumption that users are equally likely to be in each of the five age groups listed. Use 95% confidence. (b) Which age group contributes the largest amount to the sum for the x2 test statistic? For this age group, is the observed count smaller or larger than the expected count?
Transcribed Image Text:4. Between 2008 and 2011, the age distribution of users of social networking sites such as Facebook changed dramatically. In 2008, 70% of users were 35 years old or younger. In 2011, the age distribution was much more spread out. The table below shows the age distribution of 975 users of social networking sites from a survey reported in June 2011. 36-49 Age Frequency 18-22 23-35 50-65 65+ 156 312 253 195 59 (a) Test an assumption that users are equally likely to be in each of the five age groups listed. Use 95% confidence. (b) Which age group contributes the largest amount to the sum for the x2 test statistic? For this age group, is the observed count smaller or larger than the expected count?
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