A simple random sample of size 23 has mean x = 41.8. The population standard deviation is
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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.
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