Biology 2001A/B Study Guide - Final Guide: Cups, Dependent And Independent Variables, Factor 5
16 Dec 2014
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Controlled ivs process (why/how) measures dvs. ** extension of the two-sample test of means. Example of design features experiment : assessing effects of coffee. One factor coffee consumption (amount of coffee consumed variable being manipulated) 3 level defining the factor (groups which units are randomly assigned (1 cup, 2 cups or 3 cups) Scores on only 1 dv (level of productivity for each employee assessed (scores of ppl in 1 cup group, 2 cup group , 3 cup group) Compare mean scores for each level of the factor (1 vs 2 vs 3) Grand mean add total means from each level of factor group (1 cup group + 2 cup group + 3 cup group) and divide by number of factor groups. Eg: mean of 1 cup coffee group = 3. 375. Added / by 3 = mean grand = 4. 67. Calculating total variance (variance of all values in all groups )
