Dr. Gupta conducts a study to examine whether eating cookies influences memory. She draws a sample of n = 36 participants. The population from which they were selected had a mean memory score of µ = 45 on a memory test. After eating cookies, the sample mean is found to be M = 58 and the estimated standard error is 0.74. Calculate the effect size in terms of the proportion of variance accounted for (r2). 0.93 0.73 0.23 0.55

17. a researcher measures three variables, x, y, and z for each individual in a sample of n = 20. the pearson correlations for this sample are rxy = 0.6, rxz = 0.4, and ryz = 0.7. a. find the partial correlation between x and y, holding z constant. b. find the partial correlation between x and z, holding y constant. (hint: simply switch the labels for the variables y and z to correspond with the labels in the equation.) gravetter, frederick j. statistics for the behavioral sciences (p. 526). cengage learning. kindle edition.