The coefficients in Equation (7.9) were calculated when a successful launch was given a value of 1. Conduct a logistic regression analysis where 1 indicates an O-ring failure and 0 represents a successful launch.
a. Explain any relationships between the model shown in Equation (7.9) and this new model.
b. How did the regression coefficients change?
c. How did the odds ratio change?
d. Create a 95% Wald confidence interval for the new odds ratio and interpret the results.
Equation 7.9
i = eb0 + b1xi / 1 + eb0 + b1xi = e–15.043 + 0.232xi / 1 + e–15.043 + 0.232xi for i = 1, 2, 3, … , n