Of the 200 people interviewer A approached, 45 refused to be interviewed. Of 120 whom interviewer B approached, 42 declined the interview. With a significance level of 0.05, can we reject the possibility that interviewers have the same ability to obtain interviews?

Santander Serfin bank is using an additional study to examine the use of its new 24-hour ATM. Of 300 men who used the machine in the previous week, 42% made two or more transactions. Of the 250 women who used it during the same period, 50% made at least two transactions. With a level of 0.10, do women and men differ significantly in the number of transactions? Determine and interpret the p-value for this test, and then construct and interpret the 90% confidence interval for (_1-_2).

A sales agent over the phone, tries to decide between two alternative sales offers, and switches randomly between them during a day of calls With method A, 20% of 100 calls led to requests to send additional product information. For method B in another 100 calls, only 14% led to requests to send product information. With a level of 0.05, can we conclude that the difference in the results was due to chance? Determine and interpret the p-value for this test, and then construct and interpret a 95% confidence interval for (_1-_2).