Question: A local drug store claims that 93% of its orders are delivered within 20 minutes of the time the prescription is presented. A random sample of 160 orders revealed that 144 orders were delivered within the promised time.

a. With an 8% level of significance, is there enough evidence to conclude that 93 percent of orders are delivered in less than 20 minutes?

b. What is the p-value for this problem? What does it mean?

c. Construct a 92% confidence interval for the proportion of orders delivered within the promised time. What hypothesis testing conclusion can you draw using your confidence interval?