13-1. A group of workers was asked if they favored a new proposed contract that emphasizes fringe benefits rather than hourly wage rate increases.

“Yes” answers are coded as “a” and “no” answers are coded as “b.” Can the following sequence of responses be treated as if they depict a random sample? Set α = 0.05.

aa/bbb/a/b/aaa/b/aaaa/bb/aa/b/a/bbb/aa/b