Recall our study of college students in which we investigated the relationship between gender and body piercing. The null hypothesis says that the two variables are independent. (There is no relationship.) Here is the data. Female Male Row Totals Pierced Yes 576 72 648 Pierced No 64 288 352 Column Totals 640 360 1000 What percentage of the sample is not pierced? What is the expected count of females who are not pierced?

1. suppose that scores on a knowledge test are normally distributed with a mean of 71 and a standard deviation of 6. a. label the curve: show the mean and the value at each standard deviation: b. if angelica scored a 76 on the test, what is her z-score? (draw her score on the curve above and label) c. what percent of students did angelica score higher than? how can you tell? d. if 185 students took the test, how many students scored higher than angelica?