Dashboard 3. People in public places were observed to see whether Male Female they smiled during a randomly chosen 10-second Smiled 3269 4471 interval. Mark S. Chappell, Frequency of public smiling across the life span, Perceptual Didn't Smile 3806 4278 Courses and Motor Skills, 85, Nov 1997,1326. a. What proportion of females smiled? Groups b. What proportion of males smiled? Calendar c. Fill in this test from StatCrunch Two Sample Prop. Summary > Stat > Proportion Stats > Two Sample 1: Sample > With Summary, to show # of successes: how determine whether there # of observations: > is statistically significant Sample 2: evidence that males are less # of successes; History likely to smile in public than # of observations: are females. Perform: Hypothesis test for PI - P2 Studio HOPI - P2 = 0 HAPPI - P2 2 4 0 Confidence interval for PI - P2 Level: 0.95 Help & Library Outputi OStore in data Lable Resources Optional graphs and tables: P-value plot Bar plot of proportions Pronto ? Cancel Compute