Question: Use the sample information provided to construct the required confidence interval for the difference between the two population means. (a) a 90% confidence interval (b)

Use the sample information provided to construct the required confidence interval for the difference between the two population means.

(a) a 90% confidence interval

Sample 1 Sample 2 X, = s? = 131 n; = 13

(b) a 95% confidence interval

X = 105 X2 = 97 = 118 n2 = 16 %3!

(c) a 99% confidence interval

Sample 1 8 = 131 s; = 950 n, = 102 Sample

(d) an 80% confidence interval

2 82 = 149 S = 1050 n2 = 133

(e) a 98% confidence interval

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Sample 1 Sample 2 X, = s? = 131 n; = 13 X = 105 X2 = 97 = 118 n2 = 16 %3! Sample 1 8 = 131 s; = 950 n, = 102 Sample 2 82 = 149 S = 1050 n2 = 133

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