Question 1.159

1.159 Time spent studying. Do women study more than men? We asked the students in a large first-year college class how many minutes they studied on a typical weeknight. Here are the responses of random samples of 30 women and 30 men from the class:

STUDY

Women Men
170 120 180 360 240 80 120 30 90 200
120 180 120 240 170 90 45 30 120 75
150 120 180 180 150 150 120 60 240 300
200 150 180 150 180 240 60 120 60 30
120 60 120 180 180 30 230 120 95 150
90 240 180 115 120 0 200 120 120 180
  1. (a) Examine the data. Why are you not surprised that most responses are multiples of 10 minutes? We eliminated one student who claimed to study 30,000 minutes per night. Are there any other responses that you consider suspicious?

  2. (b) Make a back-to-back stemplot of these data. Report the approximate midpoints of both groups. Does it appear that women study more than men (or at least claim that they do)?

  3. (c) Make side-by-side boxplots of these data. Compare the boxplots with the stemplot you made in part (b). Which to you prefer? Give reasons for your answer.