?Using the second-order polynomial regression model from Exercise 12.1.2, a. Find a 95%
Chapter 12, Problem 12.4.2(choose chapter or problem)
Using the second-order polynomial regression model from Exercise 12.1.2,
a. Find a 95% confidence interval on both the first-order and the second-order term in this model.
b. Is zero in the confidence interval you found for the second-order term in part (a)? What does that fact tell you about the contribution of the second-order term to the model?
c. Refit the model with only the first-order term. Find a 95% confidence interval on this term. Is this interval longer or shorter than the confidence interval that you found on this term in part (a)?
Unfortunately, we don't have that question answered yet. But you can get it answered in just 5 hours by Logging in or Becoming a subscriber.
Becoming a subscriber
Or look for another answer