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Construct the indicated confidence interval for the difference between the two population means. Assume that the...

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Basic Math

Construct the indicated confidence interval for the differencebetween the two population means. Assume that the two samples areindependent simple random samples selected from normallydistributed populations. Also assume that the population standarddeviations are equal (sigma1 = sigma2), so that the standard errorof the difference between means is obtained by pooling the samplevariances. A paint manufacturer wanted to compare the drying timesof two different types of paint. Independent simple random samplesof 11 cans of type A and 9 cans of type B were selected and appliedto similar surfaces. The drying times, in hours, were recorded. Thesummary statistics are as follows. Construct a 99% confidenceinterval for mu1 - mu2, the difference between the mean drying timefor paint type A and the mean drying time for paint type B.

Answer & Explanation Solved by verified expert
3.8 Ratings (677 Votes)
AnsThe given question is the case of Two sample ttest with EQUALVARIANCE As given in the question that the population standard deviation are equal so we can assume    See Answer
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