A Gallup poll sampled 1000 adults in the United States. Of these people, 770 said they enjoyed situations in which they competed with other people. Can you conclude that less than 80% of U.S. adults like to compete? Use the critical value method with significance level α = 0.05.

a. State the null and alternate hypotheses.

b. Compute the test statistic.

c. Find the critical value.

d. State a conclusion.