Consider a hypothesis test of difference of means for two independent populations x, and x2. (a) What does the null hypothesis say about the relationship between the two population means? O H, says...

Consider a hypothesis test of difference of means for two independent populations
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Extracted text: Consider a hypothesis test of difference of means for two independent populations x, and x2. (a) What does the null hypothesis say about the relationship between the two population means? O H, says that the population means are equal. O Ho says that the population standard deviations are equal. O Ho says that the population standard deviations are different. O Ho says that the population means are different. (b) If the sample test statistic has a z distribution, give the formula for z. Hy - H2 O z = 2 n2 X1 - x2 O = 2 o. + n1 H1 - H2 O = 51 + n1 n2 X1 - x2 O = 2 + 52 n2 Hq -Hz- (xq - x2) 522 O = V n1 + n2


Extracted text: (c) If the sample test statistic has at distribution, give the formula for t. Ot = 2 + n2 X1 - x2 Ot = 2 o. + n1 H1 - Hz Ot = 51 n1 n2 Ot = 2 + 52 n2 Hy - Hz - (x1 - x2) 522 Ot = V n1 + n2