21. 01 577.006 people involved in motor vehicle accidents in Florida in a recent year. 412,878 were wearing seat belts (Florida Department of Highway Safety and Motor Vehicles).

a) Find a point estimate of the population proportion of Florida motorists wearing seal belts.

b) Construct a 99% confidence interval for the population proportion wearing seat belts at that time. Can we conclude that a majunty wore seat belts? Explain

c) For the inferences in

(a) and

(b) to be sensible, explain what you must assume about the sample data