Question: Consider a hypothesis test of difference of means for two independent populations x 1 and x 2 . (a) What does the null hypothesis say

Consider a hypothesis test of difference of means for two independent populations x1 and x2.

(a) What does the null hypothesis say about the relationship between the two population means?

(b) If the sample test statistic has a z distribution, give the formula for z.

(c) If the sample test statistic has a t distribution, give the formula for t.

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