A simple random sample of size 23 has mean x = 41.8. The population standard deviation is = 3.72. Can you conclude that the

A simple random sample of size 23 has mean x̄ = 41.8. The population standard deviation is σ = 3.72. Can you conclude that the population mean differs from 40? 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.