Question: The following sample was taken from a normally distributed population with a known standard deviation = 4. Test the hypothesis that the mean

The following sample was taken from a normally distributed population with a known standard deviation σ = 4. Test the hypothesis that the mean μ = 20 using a level of significance of 0.05 and the alternative that μ > 20:

23, 32, 22, 31, 27, 25, 21, 24, 20, 18.

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