Problem 109E

Consider the following two sample data sets, saved in the LM2_132 file:

a. Construct a box plot for each data set.

b. Identify any outliers that may exist in the two data sets.

Answer

Step 1 of 2

(a)

Consider the following two sample data sets.

Sample A |
Sample B |
||||

121 |
171 |
158 |
171 |
152 |
170 |

173 |
184 |
163 |
168 |
169 |
171 |

157 |
85 |
145 |
190 |
183 |
185 |

165 |
172 |
196 |
140 |
173 |
206 |

170 |
159 |
172 |
172 |
174 |
169 |

161 |
187 |
100 |
199 |
151 |
180 |

142 |
166 |
171 |
167 |
170 |
188 |

We need to construct a boxplot for each data set.

Using Minitab, the box plot for sample is given below:

Step to create the box plot in Minitab:

- On the opening of Minitab, you will get session handler and worksheet like Excel worksheet.
- Enter the data into the worksheet (in this case Sample A).
- After entering the data go to a menu called Graph in menu panel.
- In the Graph menu select option Box Plots, you will get one window of Boxplots.
- Under the Boxplots window, and select the simple graph option.
- After doing this, you will get another which will contain all the variables you have entered in the worksheet.
- Select the Sample A variable as Graph variables.
- After everything entered correctly, press ok and you will get the Boxplot of your data.
- Right click on the graph you have just created and select the copy graph option.

Figure 1: The box plot for sample

Using Minitab, the box plot for sample is given below:

Figure 2: The box plot for sample