In random samples of 25 and 22 from each of two normal populations, we find the following statistics: $\bar { X } _ { 1 }$ = 56, s1 = 8. $\bar { X } _ { 2 }$ = 62, s2 = 8.5.
Assume that the population variances are equal. Estimate with 95% confidence the difference between the two population means.

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The Answer of In random samples of 25 and 22 from each of two normal populations, we find the following statistics: $\bar { X } _ { 1 }$ = 56, s1 = 8. $\bar { X } _ { 2 }$ = 62, s2 = 8.5.
Assume that the population variances are equal. Estimate with 95% confidence the difference between the two population means.

In Random Samples of 25 and 22 from Each of Two