
110 Six Sigma Case Studies with Minitab
®
FIGURE 7.7
Removal of “Free Rell” from the model.
Link Function: Logit
Response Information
Variable Value Count
Satisfied Event 22
Non-event 76
Sample Size Total 98
Logistic Regression Table
Odds 95% CI
Predictor Coef SE Coef Z P Ratio Lower Upper
Constant -5.42252 1.51334 -3.58 0.000
Variety of Drinks 0.409216 0.201962 2.03 0.043 1.51 1.01 2.24
Number of Waiters 0.140952 0.0618736 2.28 0.023 1.15 1.02 1.30
Log-Likelihood = -47.170
Test that all slopes are zero: G = 10.037, DF = 2, P-Value = 0.007
Goodness-of-Fit Tests
Method Chi-Square DF P
Pearson 0.145305 2 0.930
Deviance 0.143553 2