Question: A process owner wants to know if he can reduce the mean of the process by atleast 20%, by using a different base material.In the

A process owner wants to know if he can reduce the mean of the process by atleast 20%, by using a different base material.In the old process the mean is 30 and the standard deviation is 5.How large a sample must be taken from the new process to test whether there has been adifference with a confidence of 95% and a power of 90%?

what is the formula to solve this equation? I know the answer is 6, but I don't under stand the formula

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