Question

In November 2001, the Ag Globe Trotter newsletter reported that 90% of adults drink milk. A regional farmer’s organization planning a new marketing campaign across its multicounty area polls a random sample of 800 adults living there. In this sample 696 people said that they drink milk.

a. Calculate a 95% confidence interval for the proportion of adults in this region drink milk.

b. At the 5% level, conduct a hypothesis test of the claim that 90% of adults drink milk. State the null and alternative hypothesis, calculate P-value and draw your conclusion clearly.

c. In the particular context of questions a) and b), explain the relationship between confidence interval and hypothesis testing in your own words.

Answer 1