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Mathematics, 18.06.2020 01:57 taythestargazer71
It is found that, when exposed continuously to some fixed level of a weathering agent, a sample of 8 panels of paint coating manufactured by a certain company has a mean failure time (taken to be the time when the gloss loss reaches 50%) of xÌ… =14.10 hours with a standard deviation of s =1.67 hours.
Required:
a. Assuming the failure time is normally distributed, construct a 95% confidence interval for the true mean failure time under the same conditions.
b. Interpret the interval constructed in part (a)
c. Using the estimates of the mean and standard deviation based on the sample of 8 panels as the true mean and standard deviation of failure time of a panel (assumed to be normally distributed), find the cut-off failure time that separates, among all the panels
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It is found that, when exposed continuously to some fixed level of a weathering agent, a sample of 8...
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