Читать книгу Student Study Guide to Accompany Statistics Alive! - Wendy J. Steinberg - Страница 28

1 Why are measures of dispersion important when describing a sample?

2 What aspects of the range make it a poor measure of dispersion?

3 What are the steps involved in finding the variance?

4 Why is it necessary to square the deviation scores when finding the variance?

5 What unit of measurement is used for variance? What unit of measurement is used for standard deviation? How are these different?

6 How are area units changed to linear units?

7 Why can we always expect deviation scores to sum to 0?

8 When running a marathon, there is a runner who runs at a time that is 4 SD below the mean. Would you consider this person an outlier? Why or why not?

9 How would the three measures of dispersion (variance, range, and standard deviation) be affected by adding a large number of scores close to the mean of any given distribution?

10 What does it mean for a measure to be a standardized one?

11 What is the difference between a standard deviation and a mean absolute deviation?

12 Why is the mean absolute deviation not commonly used?