Quiz

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1. Identify the categorical variables from this list: a) day of the week; b) height (metres); c) identifies as conservative or liberal; d) speed (mph); e) weight (lbs); f) speed (high, medium, low).

2. List five possible aggregate measures for a continuous variable, with a one-sentence explanation of each. For example, mean is what we generally think of as the average value, resulting from adding all the numbers up and dividing by the number of records.

3. Explain what is meant by a negative correlation.

4. You suspect that children who get less sleep per night score worse on math tests because they are tired. When drawing a scatter plot of the data, what variable would you put on the Y axis, and why?

5. Under what circumstance might you draw a chart using a logarithmic scale for one axis?

6. List these visual cues in order of the accuracy with which values from the encoded data can be perceived, from most to least accurate: a) area; b) length (on an aligned scale); c) color/hue; d) length (not aligned).

7. You need to plot the split between the Republican and Democratic vote for every presidential election since 1980. What type of chart would you choose? Explain your choice.

8. You are encoding a continuous variable by the area of circles. If a value of 10 is represented by a circle of 4 pixels radius, what is the radius in pixels of a circle corresponding to a value of 40?

9. You need to represent two categorical variables using color. If you pick yellow for one variable, what would be a good choice for the second? Explain your choice.

10. What type of color scheme would you pick to represent percentage change in population by county between the 2000 and 2010 U.S. Census: sequential, diverging, or qualitative? Explain your choice.

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