A paint manufacturer which is to compare the drying times of two types of paint. Independent...
A paint manufacturer which is to compare the drying times of two types of paint. Independent samples random samples of 11 cans of Type A and nine cans of Type B selected and applied similar services. The drying times, and hours, recorded. The summary statistics are as follows:
Type A. Type B
x1=77.5 hours. x2=63.6 hours
s1=4.5 hours. s2=5.1 hours
n1=11. n2=9.
Construct a 98% confidence interval the difference in mean drying times for type a and type B
a.) 8.42hrs < μ1-μ2 < 19.38hrs
b.) 8.28 < μ1-μ2 < 19.52
c.) 8.35 < μ1-μ2 < 19.45
d.) 8.58 < μ1-μ2 < 19.22
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what is the correct answer?
A paint manufacturer made a modification to a paint to speed up its drying time. Independent simple random samples of 11 cans of type A (the original paint) and 9 cans of type B (the modified paint) were selected and applied to similar surfaces. The drying times, in hours, were recorded. The summary statistics are as follows. Type A x1-76.3 hrx265.1hr 1-4.5 hr2 5.1 hr n1-11 The following 98% confidence interval was obtained for μ1-μ2...
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. Do not assume that the population standard deviations are equal. 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...
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