In: Statistics and Probability
A paint manufacturer wished to compare the drying times of two different types of paint. Independent simple random samples of 11 cans of type A and 9 cans of type B were selected and applied to similar surfaces. The drying times, in hours, were recorded. The summary statistics are as follows.
Type A | Type B |
1 = 76.9 | 2= 63.7 |
s1 = 4.5 | s2 = 5.1 |
n1 = 11 | n2 = 9 |
Construct a 98% confidence interval for the difference between the mean drying time for paint of type A and the mean drying time for paint of type B.
Round your answer in 2 decimal places
< μ 1 −
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Since we can assume that population variances are equal so we can use pooled SD.
Answer:
7.72 < μ 1 − μ 2 < 18.68