An article in Electronic Packaging and Production (Vol. 42, 2002) reported the effect of X-ray inspection of integrated circuits. The rads (radiation dose) were studied as a function of current (in milliamps) and exposure time (in minutes).

(a) Fit a multiple linear regression model to these data with rads as the response.

(b) Estimate σ2 and standard errors of the regression coefficients.

(c) Test for significance of and Use

(d) Use the model to predict rads when the current is 15 milliamps and the exposure time is 5 seconds. Construct a 90% PI.

(e) Use the model to compute the mean response rads when the current is 15 milliamps and the exposure time is 5 seconds. Construct a 95% PI.

(f) Interpret parts (d) and (e) and comment on the comparison between the 95% PI and 95% CI

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