In the random samples of 12 from each and every two normal populations, we found the following statistics:
(X1)=74,(X2)=71,S1=18,S2=16.
-Test with ?=.05 to find whether we can infer that the population means differ.
-Repeat Part a, rising the standard deviations to S1=210,S2=198.
-Explain what takes place when the sample standard deviations get larger.
-Repeat Part (a) with samples of size 150.
-Describe the effects of increasing the sample size.