According to a 2015 University of Michigan poll, 71.5% of high school seniors in the United States had a driver’s license. A sociologist thinks this rate has declined. The sociologist surveys 500 randomly selected high school seniors and finds that 350 have a driver’s license.

a. Pick the correct null hypothesis.

i. p = 0.715

ii. p = 0.70

iii. p̂ = 0.715

iv. p̂ = 0.70

b. Pick the correct alternative hypothesis.

i. p > 0.715

ii. p < 0.715

iii. p̂ < 0.715

iv. p ≠ 0.715

c. In this context, the symbol p represents (choose one)

i. the proportion of high school seniors in the entire United States that have a driver’s license.

ii. the proportion of high school seniors in the sociologist’s random sample that have a driver’s license.