Question: A sample mean, sample standard deviation, and sample size are given. Use the one—mean t—test to perform the required hypothesis test about the mean, u, of the population from which the sample was drawn. Use the critical-value approach.

\(\bar{x}=20.9, s=7, \mathrm{n}=11, H_{0}: \mu=18.7, H_{a}: \mu \neq 18.7, \alpha=0.05\)

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