A researcher wishes to estimate the mean number of miles driven by 4-year-old cars. The population standard deviation of miles driven by all chevy owners is 15,500 milesl how man cars must be sampled so that a 92% confidence interval will have a margin of error of 1000 miles?

Use the information given below, to compare the cost of operating two different vehicles for one month (4 weeks) you are considering two different cars. you drive to work, a 20 mile round trip, five days a week. gasoline costs you $1.50 per gallon car agets 28 miles per gallon, would have $300 a year in maintenance costs, and would cost you $1,500 per year to insure car b gets 19 miles per gallon, would have $500 a year in maintenance costs, and would cost you $1,000 per year to insure costs car a car b gas cost per month insurance cost per month maintenance cost per month $ total cost per month