A random sample of 15 hourly fees for car washers (including tips) was drawn from a normal population. The sample mean and sample standard deviation were = $14.9 and s = $6.75.

Can we infer at the 5% significance level that the mean fee for car washers (including tips) is greater than $12.5?

Can we infer at the 5% significance level that the population mean is greater than $12.5, assuming that you know the population standard deviation is equal to 6.75?