Business, 01.04.2020 16:56 HappyPom4169
In a manufacturing process, a random sample of 9 manufactured bolts has a mean length of 3 inches with a variance of .09. What is the 90 percent confidence interval for the true mean length of the manufactured bolt?
Answers: 2
represent the sample mean 
population mean (variable of interest)
represent the sample standard deviation
(1)
we need to find first the degrees of freedom, given by:
and 
, and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-T.INV(0.05,8)".And we see that 
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In a manufacturing process, a random sample of 9 manufactured bolts has a mean length of 3 inches wi...
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