As recently as 2008, 70% of users of social networking sites were 35 years old or younger. Now the age distribution is much more spread out. The table below shows the age distribution of 975 users of social networking sites from a survey reported in 2018.
Age Frequency 18-22 150 23-35 312 36-49 253 50-65 195
a) If users are equally likely to be in each of the five age groups listed, what is the expected value for each age group?
a. State the null and alternative hypothesis.
b. Report the test statistic and p-value. b) Test an assumption that users are equally likely to be in each of the five age groups listed. 65+ 99
c. Which age group contributes the largest amount to the test statistic?
d. Write a few sentences summarizing the standardized residuals.​