Chapter 2

Question 1

Question 2

Bar Graphs

Answer 2

categorical data, show magnitude

Question 3

Histogram

Answer 3

numerical data, similar to a bar graph, but the neighboring bars connect

This reflects the fact that values are sequential

Question 4

Answer 4

Unimodal, symmetrical

Question 5

Answer 5

Bimodal, symmetrical

Question 6

Answer 6

Uniform

Question 7

Answer 7

Right skewed, asymetrical

Question 8

Answer 8

Left skewed, asymmetrical

Question 9

shows how the frequencies of the categories in a response variable (rows) are contingent upon the value of an explanatory variable (columns)

Answer 9

Contingency Table

Question 10

Show Positive, Negative, or No Association

Answer 10

Scatterplots

Question 11

Explanatory variable on the x-axis and Response variable on the y-axis

Answer 11

Causation

Question 12

Either variable can be on either axis

Answer 12

Correlation

Question 13

Strip Chart vs. Violin Plot

Answer 13

Strip chart: Shows all the data points, which is ideal when there are only a few observations in each category

Violin plot: Shows the most important features of the frequency distribution and is more suitable when the number of observations is large