**Comparing box plots worksheet :**

Worksheet on comparing box plots is much useful to the students who would like to practice problems on comparing box plots.

**Problem 1 : **

The box plots show the distribution of times spent shopping by two different groups.

**Questions :**

1. Compare the shapes of the box plots.

2. Compare the centers of the box plots.

3. Compare the spreads of the box plots.

4. Which group has the greater variability in the bottom 50% of shopping times ? The top 50% of shopping times ? Explain how you know.

**Problem 2 :**

The box plots show the distribution of the number of team wristbands sold daily by two different stores over the same time period.

**Questions :**

1. Compare the shapes of the box plots.

2. Compare the centers of the box plots.

3. Compare the spreads of the box plots.

**Answers for the questions in problem 1 :**

1. Compare the shapes of the box plots.

The positions and lengths of the boxes and whiskers appear to be very similar. In both plots, the right whisker is shorter than the left whisker.

2. Compare the centers of the box plots.

Group A’s median, 47.5, is greater than Group B’s, 40. This means that the median shopping time for Group A is 7.5 minutes more.

3. Compare the spreads of the box plots.

The box shows the interquartile range. The boxes are similar.

Group A: 55 - 30 = 25 min Group B: About 59 - 32 = 27 min

The whiskers have similar lengths, with Group A’s slightly shorter than Group B’s.

4. Which group has the greater variability in the bottom 50% of shopping times ? The top 50% of shopping times ? Explain how you know.

Group A; Group B; look at which box plot has a greater distance from the median to the minimum or maximum value, respectively.

**Answers for the questions in problem 2 :**

1. Compare the shapes of the box plots.

Store A’s box and right whisker are longer than Store B’s.

2. Compare the centers of the box plots.

Store A’s median is about 43, and Store B’s is about 51. Store A’s median is close to Store B’s minimum value, so about 50% of Store A’s daily sales were less than sales on Store B’s worst day.

3. Compare the spreads of the box plots.

Store A has a greater spread. Its range and inter quartile range are both greater.

Four of Store B’s key values are greater than Store A’s corresponding value.

Store B had a greater number of sales overall.

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