In random samples of 25 from each of two normal populations, we found the following statistics:

x1 bar = 524 s1 = 129

x2 bar = 469 s2 = 131

a) estimate the difference between the two population means with 95% confidence.

b) repeat part a) increasing the standard deviations of s 1 to 255 and s 2 to 260.

c) describe what happens when the sample standard deviations get larger.

d) repeat part a) with samples of size 100.

e) discuss the effects of increasing the sample size.

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