In: Statistics and Probability
You are tasked with a process selection project. There are two processes (A and B) that could potentially work for your application (cutting tubing to a specified length). Sample data is provided by the two companies. Out of the 16 samples from process A, you find an average of 17.92 inches and a standard deviation of 1.98 inches. Thirteen samples were taken from process B improvement and had an average length of 16.58 inches and a standard deviation of 1.30 inches.
a)
confidence interval contains 1,so we can say that there is not sufficient evidence to conclude that population variance differ.
b)
confidence interval does not contain zero so we can say that mean length from two population differs.
c)
confidence interval contains 0 so we can say that two proportion of defective units cannot differ.
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