15.10 Tea versus coffee Which of the two beverages do people prefer more—tea or coffee? For the employees surveyed at a company, 24 prefer drinking tea and 30 prefer coffee.

Let p denote the corresponding population proportion who prefer tea.

a. Find the test statistic for the sign test of H0: p = 0.50 against Ha: p • 0.50.

b. Refer to part

a. Find and interpret the P-value.