1. A random sample of 45 cars that passed a specific interstate milepost at an average speed of 74.04 miles per hour. Assume the speed of the cars passing the milepost is normally distributed with a standard deviation of 6 miles per hour. Test the claim at the significance level of 0.10 that the average speed of the population of cars passing this milepost is not 65 miles per hour.

What sort of results or evidence would you like to see to convince you that the claim is likely to be correct?

In this context, what does statistically significant mean?