Question: testing whether the means of two normal populations are equal, summary statistics computed for two independent samples are as follows: n1 = 25, ????????1 =

testing whether the means of two normal populations are equal, summary statistics computed for two independent samples are as follows:

n1 = 25, ????????1 = 7.30, s1 = 1.05.

n2 = 30, ????????2 = 6.80, s2 = 1.20.

Assume that the population variances are equal. Then the standard error of the sampling distribution of the sample mean difference ????????1????????2 is equal to:

0.3072.

0.0917.

0.3028.

0.0944.

why it is A

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