Essay
In testing the hypotheses:
H0: 1 - 2 = 0
HA: 1 - 2 0,
two random samples from two normal populations produced the following statistics:
n1 = 51, x1-bar = 35, s1 = 28.
n2 = 40, x2-bar = 28, s2 = 10.
Assume that the two population variances are different.
a. Estimate with 95% confidence the difference between the two population means.
b. Explain how to use this confidence interval for testing the hypotheses.
Correct Answer:

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a. 7 ± (2.009)(4.2276) = (-1.4...View Answer
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