1. A used car dealer says that the mean price of used cars sold in the last 12 months is at least $21,000. You suspect this claim is incorrect and find that a random sample of 14 used cars sold in the last 12 months has a mean price of $19,189 and a standard deviation of $2,950. Is there enough evidence to reject the dealer's claim at = 0.05? Assume the population is normally distributed. State in words, the null and alternative hypotheses. Null: Alternative: