Exercise 7.11.2

Model Answers to 07 Hypothesis Testing in Six Sigma Statistics using Minitab 17, Green Belt Edition.

Example 7.11.2

Measure the PSS of a 2 sample t Test


Establish the Power that you achieve with a 2 sample t test under the following conditions

1) A two-way test where you are only considering if the alternate is different to the null hypothesis

2) You have a sample size of 60 in each group.

3) You are interested in being able to detect a difference of 1
4) The historical StDev has been 3.

Before running the procedure try and estimate the power value that would be achieved and then compare your guess to the answer.


Set-Up

Analysis

1.  Click Stat <<Power & Sample Size<< 2 Sample t


2.  Complete the menu as shown and click OK to execute the procedure.



The power curve shows that a Power of 44% would be achieved. This falls far short of the minimum 80% requirement.