Question: A simple random sample of size 22 has mean x = 91.7 and standard deviation s = 19.3. The population is normally distributed. Can you

A simple random sample of size 22 has mean ̄x = 91.7 and standard deviation s = 19.3. The population is normally distributed. Can you conclude that the population standard deviation is greater than 15? 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.

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