A simple random sample of size 65 has mean x = 38.16. The population standard deviation is
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A simple random sample of size 65 has mean x̄ = 38.16. The population standard deviation is σ = 5.95. Can you conclude that the mean is less than 40? Use the
α = 0.01 level of significance.
In Exercises 1–4, state which type of parameter is to be tested; then perform the hypothesis test.
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