
Concept explainers
Pass the popcorn: Following are the running times (in minutes) for the top 15 grossing movies of all time rated PG-13, and the top 15 grossing movies of all time rated R.
- Construct back-to-back stem-and-leaf plots for these data sets.
- Do the running times of R-rated movies differ greatly from the running times of movies rated PG or PG-13: or are they roughly similar?
a.

To construct: A back-to-back slit stem-and-leaf plot for the data set.
Explanation of Solution
Given information:
The Following table represents the running times (in minutes) for the top 15 grossing movies
Movies Rated PG-13
Star Wars: The force Awakens | 136 |
Avatar | 162 |
Titanic | 194 |
Jurassic Park | 124 |
The Avengers | 143 |
The Dark Knight | 152 |
Avengers: Age of Ultron | 141 |
The Dark Knight Rises | 164 |
The Hunger Games: Catching Fire | 146 |
Pirates of the Caribbean: Dead Man’s Chest | 151 |
Iron Man 3 | 129 |
The Hunger Games | 142 |
Captain Americs: Civil War | 147 |
Spider-Man | 121 |
Jurassic Park | 127 |
Movies Rated R
The Passion of the Christ | 126 |
Deadpool | 106 |
American Sniper | 132 |
The Matrix Reloaded | 138 |
The Hangover | 96 |
The Hangover Part II | 102 |
Beverly Hills Cop | 105 |
The Exorcist | 122 |
Ted | 106 |
Saving Private Ryan | 170 |
300 | 117 |
Wedding Crashers | 113 |
Terminator 2: Judgment Day | 137 |
22 Jump Street | 112 |
Gladiator | 155 |
Definition used: Stem plot is a tool to visualize the shape of a distribution.
Calculation:
The back-to-back slit stem-and-leaf plot for the data set is given by
In the above back-to-back slit stem-and-leaf plot, Leaf 1 displays the lengths of time of the PG-13 movies and Leaf 2 does so for the R rated movies.
b.

To explain: Whether the running times of R-rated movies differ greatly from the running times of movies rated PG or PG-13, or they roughly similar.
Explanation of Solution
Given information: Following are the running times (in minutes) for the top 15 grossing movies of all time rated PG-13, and the top 15 grossing movies of all time rated R.
Movies Rated PG-13
Star Wars: The force Awakens | 136 |
Avatar | 162 |
Titanic | 194 |
Jurassic Park | 124 |
The Avengers | 143 |
The Dark Knight | 152 |
Avengers: Age of Ultron | 141 |
The Dark Knight Rises | 164 |
The Hunger Games: Catching Fire | 146 |
Pirates of the Caribbean: Dead Man’s Chest | 151 |
Iron Man 3 | 129 |
The Hunger Games | 142 |
Captain Americs: Civil War | 147 |
Spider-Man | 121 |
Jurassic Park | 127 |
Movies Rated R
The Passion of the Christ | 126 |
Deadpool | 106 |
American Sniper | 132 |
The Matrix Reloaded | 138 |
The Hangover | 96 |
The Hangover Part II | 102 |
Beverly Hills Cop | 105 |
The Exorcist | 122 |
Ted | 106 |
Saving Private Ryan | 170 |
300 | 117 |
Wedding Crashers | 113 |
Terminator 2: Judgment Day | 137 |
22 Jump Street | 112 |
Gladiator | 155 |
The back-to-back slit stem-and-leaf plot for the data set is given by
From the above back-to-back slit stem-and-leaf plot, the R-rated movies tend to be shorter.
Therefore, they differ greatly.
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Chapter 2 Solutions
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