A used car dealer claims that the median cost of a used car is $12,000. In a random sample of 15 used cars, you find that 8 of them have a price below $ 12,000 and that 4 of them have a price above...

A used car dealer claims that the median cost of a used car is $12,000. In a random sample of 15 used cars, you find that 8 of them have a price below $ 12,000 and that 4 of them have a price above $12,000. Test the claim of the used car dealer at the 5% significance level using the sign test.