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Examining the Confidence Intervals for Two Populations

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Consider the result in the following table for two random sample taken from two populations:

Sample 1

n1 = 50
-
x = 22

Ïƒ1 = 4

Sample 2

n2=35
-
x2 = 14

Ïƒ2= 5

a) provide a 90% confidence interval for difference between the two population means.

b) provide a 97% confidence interval for the difference between the two population means.

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Solution Preview

Consider the result in the following table for two random sample taken from two populations:

Sample 1

n1 = 50
-
x = 22

Ïƒ1 = 4

Sample 2

n2=35
-
x2 = 14

Ïƒ2= 5

a) provide a 90% confidence interval for difference between the two population means.

Given n1=50, xbar1=22, ...

Solution Summary

The solution examines the confidence intervals for two populations. A 90% and 97% confidence interval for the difference is provided.

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