Question

According to a travel reduction survey at a state university, 16% of employees rode bicycles to campus for work at least 3 days per week during the pst 365 days. The survey was based on a sample of 125 employees.

(a) Use this information to calculate 98% confidence intercal for the true proportion of empliyees who rode a bike to work at least 3 days per week. Be sure to state and adress any assumptions needed for the interval.

(b) What is the margin of error for estimate in part (a)?

(c) What sample size is needed if the margin of error mus be no more than 2.5%?

Answer 1