Data

Question 1

What key feature makes a bar graph useful?

Answer 1

Length of each bar lets you compare categories quickly.

Question 2

How does a double bar graph differ from a single bar graph?

Answer 2

It places two bars per category to compare two groups, using a legend to distinguish them.

Question 3

Why choose a line graph?

Answer 3

It shows how a variable changes over time through connected data points.

Question 4

Before drawing a pie chart, what must you do with raw counts?

Answer 4

Convert each category count to a percentage of the total.

Question 5

What does each dot represent in a dot plot?

Answer 5

One individual data point.

Question 6

In a stem-and-leaf plot, what are “stems” and “leaves”?

Answer 6

The stem is all but the final digit; the leaf is the final digit of each number.

Question 7

What does bin height represent in a histogram?

Answer 7

The frequency of data values within that interval.

Question 8

Which five numbers define a box plot?

Answer 8

Minimum, Q1, median (Q2), Q3, maximum.

Question 9

What does a positive correlation look like on a scatterplot?

Answer 9

Points trend upward from lower left to upper right.

Question 10

List two ways a vertical scale can mislead readers.

Answer 10

Skipping numbers or not starting at zero.