The process engineer designed a study to evaluate the quality of plastic irrigation pipes. The study involved a total of 48 pipes; 24 pipes were randomly selected from each of the company€™s two manufacturing plants. The pipes were heat- treated at one of four temperatures (175, 200, 225, 250° F). The pipes were chemically treated with one of three types of hardeners (H1, H2, H3). The deviations from the nominal compressive strength were measured at five locations on each of the pipes.

Identify each of the following components of the experimental design.
a. Factors
b. Factor levels
c. Blocks
d. Experimental unit
e. Measurement unit
f. Replications
g. Covariates
h. Treatments

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