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# Confidence Interval

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Using the following information, construct a 90% confidence interval for (:1 - :2).
Sample 1: n = 8 mean = 151 standard deviation = 31
Sample 2: n=21 mean = 130 standard deviation = 72

please show results of all steps in the process.

##### Solution Summary

The solution constructs a 90% confidence interval for (:1 - :2).

Sample 1: n = 8 mean = 151 standard deviation = 31
Sample 2: n=21 mean = 130 standard deviation = 72

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Description Confidence Interval
Posting Using the following information, construct a 90% confidence interval for (:1 - :2).
Sample 1: n = 8 mean = 151 standard deviation = 31
Sample 2: n=21 mean = 130 standard deviation = 72

please show results of all steps in the process.

Sample 1 (for 90% confidence interval):

1. Calculate the estimated standard error of the mean ...

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