Refer to the data in Digits that are described in Exercise 7.28. The 150 students were also asked to give the last two digits of their nine-digit social security number. Those digits are stored in SSN8 and SSN9 in the same file. Does the government do a better job at assigning numbers at random? Pick either of the two columns (SSN8 or SSN9) and use technology to test whether there is evidence that the digits are not equally likely (H_a: Some p_i ≠ 0.10).

Exercise 7.28

How well can people generate random numbers? A sample of students were asked to write down a ‘‘random” four-digit number. Responses from 150 students are stored in the file Digits. The data file has separate variables (RND1, RND2, RND3, and RND4) containing the digits in each of the four positions.