Читать книгу Student Study Guide to Accompany Statistics Alive! - Wendy J. Steinberg - Страница 20

1 Here are the results of a pop quiz given in an American history course: 2, 1, 9, 3, 2, 4, 5, 6, 7, 8, 2, 3, 7, 7, 2, 4, 7, 8, 5. The quiz was graded on a scale of 1 to 10. What are the mean, median, and mode of these scores?

2 Which measure of central tendency would best describe the distribution of the scores given in Question 1?

3 You have just completed teaching a computer science course for the first time. Many of your students did not do well, and the distribution of final grades was positively skewed. You would rather not terrify your students at the start of your next class, so you decide to be a little deceptive with how you report the performance of your previous students. Which measure of central tendency would be the most appropriate?

4 Following the example from Question 3, you only have 10 students enroll in your course the following semester. After the first test, you obtain the following grades (on a 0–70 scale): 45, 64, 57, 34, 65, 49, 44, 58, 58, 62. What is the mean of your class grades?

5 If you were to add one outlier to a symmetrical distribution, what would you expect to happen with regard to the measures of central tendency?