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Essay Quiz
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1

What is “exploratory data analysis” and why is it important to use it before using inferential statistics.
2

Discuss the steps you would take when organizing your data for computer entry. In your answer lay out some data in a stacked and an unstacked format.
3

Explain why it is a good idea, when possible, to evaluate individual as well as grouped data.
4

Compare and contrast bar and line graphs. When is it most appropriate to use each? Why is it important to graph your data?
5

Describe the differences between the different shapes that line graphs can take. What does each shape suggest about data trends?
6

What is a frequency distribution? What are the two methods discussed in your text for displaying frequency distributions?
7

List and discuss the four major measures of center. How is each computed? Order them in terms of how much information is provided, and indicate when you might want to use each.
8

Do the same for the measures of spread as you did for the measures of center in question 2.
9

What is the five-number summary and what does it tell you? Using some numbers that you make up construct a boxplot representing those numbers.
10

Discuss each of the factors cited in the text that affect the magnitude and/or direction of the Pearson correlation coefficient.
11

Discuss bivariate linear regression. What is it used for and what are the various components yielded by the analysis? How do you interpret a regression equation?





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