An article in Agricultural Engineering (December 1964, pp. 672€“673) describes an experiment in which the daily weight gain of swine is evaluated at different levels of housing temperature. The mean weight of each group of swine at the start of the experiment is considered to be a nuisance factor. The data from this experiment are as follows:

(a) Does housing air temperature affect mean weight gain? Use a = 0.05.
(b) Use Fisher€™s LSD method to determine which temperature levels are different.
(c) Analyze the residuals from this experiment and comment on model adequacy.

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Housing Air Temperatures (degrees F) Mean Weight (Ibs) 50 60 70 80 90 100 1.37 100 1.58 2.00 1.40 0.39 1.97 1.75 150 1.47 2.16 1.82 1.14 -0.19 2.22 0.88 200 1.19 1.91 1.67 -0.77