Refer to Exercise 14.33. Computer output is shown for an analysis of variance for both...

Refer to Exercise 14.33. Computer output is shown for an analysis of variance for both dependent variables (i.e., of active ingredient and Draw conclusions about the stability of these 2-mL vials based on these analyses. Use α = .05.

REFERENCE:

14.33 : Researchers were interested in the stability of a drug product stored at four lengths of storage times (1, 3, 6, and 9 months). The drug was manufactured with 30 mg/mL of active ingredient of a drug product, and the amount of active ingredient of the drug at the end of the storage period was to be determined. The drug was stored at a constant temperature of 30°C. Two laboratories were used in the study with three 2-mL vials of the drug randomly assigned to each of the four storage times. At the end of the storage time, the amount of the active ingredient was determined for each of the vials. A measure of the Ph of the drug was also recorded for each vial. The data are given here.

a. Write a model relating the response measured on each vial to the factors, length of storage time, and laboratory.

b. Display an analysis of variance table for the model of part (a) without computing the necessary sum of squares.