1.

9.11 In an experiment, 37' volunteers with influenza or influenza symptoms were observed: each with and without a face mask. Experimenters measured the number of fine influenza particles in tooth settings. The data is available in Fosdata: :masks . a. Make a plot or plots to confirm that the mask_-Fine and no_mask_-Fine variables are highly,r skewed and inappropriate for a t-test. p. Does a ttest detect a difference in particles for the mask and no mask conditions? c. Does a 1ll'li'ilcokon test detect a difference in particles for the mask and no mask conditions? to 9.1 Suppose you wish to test Ho : / = 2 versus Ha : / / 2 using a Wilcoxon signed rank test. If you collect 30 samples, what is the expected value of the test statistic V under the null hypothesis