STA221H1 Lecture Notes - Lecture 59: Multiple Comparisons Problem, John Tukey, Factorial Experiment
24 Apr 2018
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Textbook exercises set 48: obtain the estimated marginal means for the levels of display factor. Main e ect of display is likely to be present. That is, averaging over price, mean sales (in units) for normal display size plus end of aisle appears to be the greatest, whereas normal display size appears to have the least sales. Twice the normal display size has an intermediate mean number of sales: fit a complete factorial design model: # yijk. = ij ijk in r. obtain the anova table for sales using the aov function. Suppose the researchers aimed to investigate the interaction e ect, and the main e ects. For each factor e ect: state the null and the alternative hypotheses using symbols, state the value of the test-statistic and its p-value, make a decision regarding whether to reject or fail to reject ho. iv.
