Polynomial Model Approximations
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The experimental units for this experiment are the refrigerators, and although we have 12 measurements on each refrigerator, these measures do not provide independent replications of the six different temperature levels. In actuality, only one independent piece of information is available for each temperature level, the mean of the 12 observed values for each quality variable. Once again, one is faced with trying to gather useful information from a nonreplicated experiment.