Asurvey of 50 retail stores revealed that the average price of a microwave was $375, with a sample standard deviation of $20. assuming the population is normally distributed, what is the 95% confidence interval to estimate the true cost of the microwave?

With signals from no-claim bonuses and deductibles, a. the marginal cost curve for careful drivers lies to the left of the marginal cost curve for aggressive drivers b. auto insurance companies insure more aggressive drivers than careful drivers because aggressive drivers have a greater need for the insurance c. the market for car insurance has a separating equilibrium, and the market is efficient d. most drivers pay higher premiums than if the market had no signals