Is this correct

According to a recent poll at a university, 71.9% of high school seniors in a certain region had a driver's license. A sociologist thinks this rate has declined. The sociologist surveys 450 randomly selected high school seniors and finds that 315 have a driver's license. a. Pick the correct null hypothesis. b. Pick the correct alternative hypothesis. c. In this context, what does the symbol p represent? . ... . a. The null hypothesis is Ho: P = 0.719. b. The alternative hypothesis is Ha: p #0.719. c. Determine the meaning of p in the given context. The symbol p represents the population proportion of high school seniors in the entire region that have a driver's license