3)The Wall Street Journal reported that automobile crashes cost the United States $162 billion annually (The Wall Street Journal, March 5, 2008). The average cost per person for crashes in the Tampa, Florida, area was reported to be $1599. Suppose this average cost was based on a sample of 50 persons who had been involved in car crashes and that the population standard deviation is σ = $600. a)What is the 95% confidence interval for the population mean? b)Write the interpretation of your answer in words. c)Determine the appropriate sample size for a margin of error of $100 with a 99% confidence level?