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Should the statistician use a t distribution a normal

Should the statistician use a t distribution, a normal distribution, or neither to test the null hypothesis?

The sample mean (x-bar) for a data set is 131.8, s is 16.7 and n = 12. The data is approximately normal and σ is unknown.

H0: µ = 136.8

H1: µ ≠ 136.8

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Basic Statistics: Should the statistician use a t distribution a normal

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