The Wall Street Journal reported that automobile crashes cost the United States $162 billion annually. The average cost per person for crashes in Bethlehem, PA was reported to be $1599. Suppose the average cost was based on a sample of 50 persons who had been involved in car crashes and that the population standard deviation is $600. Find the following: a. A point estimate of the (population) average cost per person of automobile crashes (as always, do not use neither the $ sign nor commas): - b. The margin of error (using 99% confidence) for your point c. How large a sample would have to be taken to make the margin of error one-half the size that you calculated in part (b) above? E