Question: You are testing H0: = 10 against Ha: < 10 based on an SRS of 20 observations from a Normal population. The t

You are testing H0: μ = 10 against Ha: μ < 10 based on an SRS of 20 observations from a Normal population. The t statistic is t = −2.25. The degrees of freedom for this statistic are

(a) 19.

(b) 20.

(c) 21.

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