A simple random sample of size 65 has mean x = 57.3. The population standard deviation is = 12.6. Can you conclude that the

A simple random sample of size 65 has mean x̄ = 57.3. The population standard deviation is σ = 12.6. Can you conclude that the population mean is less than 60? Use the α = 0.05 level of significance.

In Exercises 5–12, state which type of parameter is to be tested; then perform the hypothesis test.