QUESTION 19 construct the indicated confidence interval for the difference between the two population means. Assume that the two samples are independent simple random samples selected from normally distributed populations. Aiso assume that the population standard deviations are equal (sigma1 sigma2), so that the standard error of the difference between means is obtained by pooling the sample variances. A paint manufacturer wanted 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| x1 = 70.9 hr x2 68.4 hr Туре В $1 3.7 hr $2 = 3.2 hr 6 = Tu ce interval for mu1 - mu2, the difference between the mean ni = 11 Construct a 999% con drying time for paint type A and the mean drying time for paint type B. -2.73 hrs < mu1 - mu2 < 7,73 hrs -0.64 hrs < mu1 - mu2 < 5.64 hours U-1.50 hrs < mu1 - mu2 < 6.50 hrs U -2.01 hrs < mu1 - mu2 < 7.01 hrs QUESTION 20 tonth

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QUESTION 19
construct the indicated confidence interval for the difference between the two
oopulation means. Assume that the two samples are independent simple random
samples selected from normally distributed populations. Aiso assume that the
population standard deviations are equal (sigma1 sigma2), so that the standard
error of the difference between means is obtained by pooling the sample variances.
A paint manufacturer wanted 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|
x1 = 70.9 hr x2 = 68.4 hr
$1 = 3.7 hr
s2 = 3.2 hr
nį = 11
6 = Zu
Construct a 99% confidence interval for mu1 - mu2, the difference between the mean
drying time for paint type A and the mean drying time for paint type B.
-2.73 hrs < mu1 mu2 <7.73 hrs
-0.64 hrs < mu1 - mu2 < 5.64 hours
0.1.50 hrs < mu1 - mu2 < 6.50 hrs
U -2.01 hrs < mu1 mu2 < 7.01 hrs
QUESTION 20
dent Find d to the nearest tenth.
Transcribed Image Text:QUESTION 19 construct the indicated confidence interval for the difference between the two oopulation means. Assume that the two samples are independent simple random samples selected from normally distributed populations. Aiso assume that the population standard deviations are equal (sigma1 sigma2), so that the standard error of the difference between means is obtained by pooling the sample variances. A paint manufacturer wanted 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| x1 = 70.9 hr x2 = 68.4 hr $1 = 3.7 hr s2 = 3.2 hr nį = 11 6 = Zu Construct a 99% confidence interval for mu1 - mu2, the difference between the mean drying time for paint type A and the mean drying time for paint type B. -2.73 hrs < mu1 mu2 <7.73 hrs -0.64 hrs < mu1 - mu2 < 5.64 hours 0.1.50 hrs < mu1 - mu2 < 6.50 hrs U -2.01 hrs < mu1 mu2 < 7.01 hrs QUESTION 20 dent Find d to the nearest tenth.
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