Question: 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

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

Pipe No. Plant Temperature F) Hardener Pipe No. Plant Temperature F) Hardener :E , 200 75 200 75 200 75 200 75 250 125 50 125 50 125 50 125 50 125 50 125 50 125 "2121.2 1 2 1 2 1 2 221122112211222211221122 5 6 7 8 9 21 22 23 24 25 26 27 28 39 40 41 42 43 44 45 46 47 48 6789 200 125 200 125 200 75 200 125 200 125 200 75 200 75 250 25 250 125 250 07070707070707525 21 2 1 2 1 2 1 2 1 2 2 1 2 2 2 2 2 2 2 2 2 250 125 250 lai 1 1 2 2 1 1 2 2 1 1 2 2 1 1 1 1 2 2 1 1 2 2 1 1 12345678911234 29 30 31 33 34 35 36 37 38

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