Minitab Notes for Activity 7

Finding the P-value for a Chi-Squared Test (Questions 9,22)

Since we didn't use the built in routines of Minitab to find the test statistic (it doesn't do a Chi-Squared Goodness of Fit Test), it didn't give us a p-value. The p-value is the probability of being more extreme than the test statistic. Since this is a right tail test, it is the probability of being to the right of the test statistic.

  1. Choose Calc / Probability Distribution / Chi-Square
  2. Choose Cumulative Probability
  3. Enter the proper number of degrees of freedom (one less than the number of categories)
  4. Click on Input Constant. Enter your test statistic as the constant
  5. Click OK
  6. Minitab returns the area to the left of the test statistic, but we need the area to the right. Subtract the probability Minitab gives you from 1 to find the p-value.