Finding Evidence to Reject Agencies Claims

1. A regulatory agency claims the meanweekly telemarketing calls a citizen receives is 18 or less. A consumer advocacy group surveyed 81 citizens and found that the mean number of calls they received weekly was 19. At a level of significance of alpha = 0.05 is there sufficient evidence to reject the agencies claim? Assume standard deviation= 4.

The solution finds evidence in order to reject agencies claims in telemarketing.