11.58 Of 200 subjects approached by interviewer A, 45 refused to be interviewed. Of 120 approached by interviewer B, 42 refused an interview. At the 0.05 level of significance, can we reject the possibility that the interviewers are equally capable of obtaining interviews?
11.59 Community National Bank is using an observa- tional study to examine the utilization of its new 24-hour banking machine. Of 300 males who used the machine last week, 42% made two or more transactions before leaving.
Of 250 female users during the same period, 50% made at least two transactions while at the machine. At the 0.10 level, do males and females differ significantly in terms of making multiple transactions? Determine and interpret the p-value for this test, then construct and interpret the 90% confidence interval for 7T1 2 7T2.