XmRdata

Objective: There is thought among some people at your facility that there is an old method and a recent method being used that are producing product at different thicknesses. You DO NOT WANT the methods to be different.In fact, you want the methods to be producing products that are the same. To address this, you suggest using a T test.If the methods are significantly different, you have a problem. If the null is NOT rejected--that is good news!The team agrees that a sample size of 25 is adequate for the test.Remember...You are hoping the null does not get rejected.If it is rejected, though, you have found a definite root cause! The team decides a significance level at 0.05 for the test.

What is the null hypothesis ?

What is the alternative hypothesis?