An unhappy customer is frustrated with the waiting time at the post office when buying stamps. Upon registering his complaint, he was told, “You wait more than 1 minute for service no more than half of the time when you only buy stamps.” Not believing this to be the case, the customer collected some data from people who had just purchased stamps only. The sample statistics are n  60 and x  n (wait more than 1 minute)  35.

At the 0.02 level of significance, does our unhappy customer have sufficient evidence to refute the post office’s claim?

PART III: Understanding the Concepts