A simple random sample of size 13 has mean x = 7.26 and standard deviation s =
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A simple random sample of size 13 has mean x̄ = 7.26 and standard deviation s = 2.45. The population is approximately normally distributed. Can you conclude that the population mean differs from 9? Use the α = 0.01 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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