1. Ungraded quiz
Unit 4

2. Show me your fingers
Do not shout out the answer, or your classmates will follow what you said.
Use your fingers
One finger (the right finger) = A
Two fingers = B
Three fingers = C
Four fingers = D
No finger = I don’t know. I didn’t study

3. When there are too many variables, what problem do we face?
Over-plotting
Curse of dimensionality
Bandwidth
Bandheight

4. When there are too many data, what problem do we face?
Over-plotting
Curse of dimensionality
Bandwidth
Bandheight

5. When there is one variable, which graphing format is the best?
Pie chart
Donut chart
Bar chart
All are good

6. When the frequency count is partitioned by two grouping variables, which graphing format is the best?
Side by side bar chart
Stacked bar chart
Slopegraph or parallel coordinate plot
All are good

7. When there is one continuous variable and the data range is very wide, which graphing method is the best?
Histogram only.
Density smoothing only.
Superimpose a density smoother on a histogram.

8. When there is a continuous variable and a grouping factor, which graphing method should be used?
Two histograms
Pyramid graph
Superimpose a violin plot on a boxplot
All are good but B and C are better than A

9. What information can a violin plot provide?
Distributional information
Quantile information
Two-dimensional contour lines
A and B

10. Which of the following statement is true?
The heat map shows the density of the data by contour lines.
The nonparametric density shows the concentration of the data by colors only.
The nonparametric density shows the concentration of the data by colors and contour lines.