# 8.03 Comparative inferences

## Interactive practice questions

The weights of a group of men and women were recorded and presented in a stem and leaf plot as shown.

 Men Women
 Click to view stem and leaf plots.
 Key: 4 | 2 $=$= 42 kg
a

What is the mean weight of the group of men? Express your answer in decimal form.

b

What is the mean weight of the group of women? Express your answer in decimal form.

c

Which group is heavier?

Men

A

Women

B

Men

A

Women

B
Easy
Approx 3 minutes

Isabelle thinks there may be a difference in the way males and females compute certain puzzles. She gave an equal number of boys and girls a knot to undo and recorded how long (in seconds) it took each of them. The results are presented in the table:

The following box-and-whisker plot shows the number of points scored by two basketball teams in each of their matches last season.

The following histograms show the season results of two soccer groups, Group A and Group B, and the number of games (frequency) in which they scored a certain number of goals (scores).

### Outcomes

#### NY-7.SP.3

Informally assess the degree of visual overlap of two quantitative data distributions.

#### NY-7.SP.4

Use measures of center and measures of variability for quantitative data from random samples or populations to draw informal comparative inferences about the populations.