Consider the wire bond pull strength data in Exercise 12-8.
(a) Find 95% confidence interval on the regression coefficients.
(b) Find a 95% confidence interval on mean pull strength when x2 = 20, x3 = 30, x4 = 90 and x5 = 2.0.
(c) Find a 95% prediction interval on pull strength when x2 = 20, x3 = 30, x4 = 90, and x5 = 2.0.