AP Stats: Stem-and-Leaf Plots

The data below are the number of doubles (hits where the batter gets to second base) each team in the American League had hit by midseason, 1999. Which of the sets of stems would be correct for the data below? (Don't worry about the leaves.)

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The data below are the batting averages for every team in the American League at about midseason in 1999.

NOTE: Batting average is [ (# of times at bat that result in getting safely on a base) / (total # of times at bat) ]

"# of times at bat" has a specific definition which excludes walks and certain other situations.

Choose the stem-and-leaf plot that accurately reflects the data.

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This stem-and-leaf plot shows the number of triples (when the batter reaches third base) each American League team had scored by midseason, 1999. How many teams had at least 10 triples by midseason?

• 12

• 2

• 8

• 3

• Can't tell with this plot

This stem-and-leaf plot shows the number of triples (when the batter reaches third base) each American League team had scored by midseason, 1999. What are the minimum and the maximum number of triples by an American League team at midseason?

• 0 and 20

• 0 and 28

• 8 and 38

• 8 and 28

• Can't tell with this plot

This stem-and-leaf plot shows the number of triples (when the batter reaches third base) each American League team had scored by midseason, 1999. How many American League teams had from 15 to 25 triples by midseason?

• 7

• 6

• 8

• 0

• Can't tell with this plot

Below is the stem-and-leaf plot for the slugging percentages of all National League teams at midseason in 1999, shown here as proportions. What values for slugging average have a frequency of at least 2?

NOTE: Slugging percentage is: # of bases reached / total # of times at bat

"# of times at bat" has a specific definition which excludes walks and certain other situations.

• .432 only

• .403 and .427

• .403, .427, and .459

• .403, .427, .459, and .466

• .403, .427, .459, and .446

Below is the stem-and-leaf plot for the slugging percentages
(# of bases reached / total# of times at bat )
of ALL National League teams at midseason in 1999, shown here as proportions. How many baseball teams are there in the National League?

• 7

• 14

• 16

• 23

• Can't tell from this plot

Back-to-back stem-and-leaf plots can be used to compare distributions of the same variable for two different populations. This back-to-back plot compares the numbers of home runs for baseball teams in the American League versus the National League at midseason, 1999.

• American, 149, National

• National, 116, American

• National, 149, American

• American, 118, American

• American, 149, American

This back-to-back plot compares the numbers of home runs for baseball teams in the American League versus the National League at midseason, 1999.

True or False: Among the numbers of home runs made by National League teams, the greatest frequency is in the 90s; overall (considering both leagues), the greatest frequency is in the 80s.

• True

• False

This back-to-back plot compares the numbers of home runs for baseball teams in the American League versus the National League at midseason, 1999.

How many fewer home runs did the team with the fewest home runs in the American League have than the team with the fewest home runs in the National League? How many more home runs did the highest hitter of home runs American League team have than the highest hitter of home runs in National League team?

• 2, 798

• 4, 25

• 14, 33

• 4, 33

• 14, 35