Software to Simplify Statistical Practice ...




Subjects were students in grades 4-6 from three school districts in Ingham and Clinton Counties, Michigan. Chase and Dummer stratified their sample, selecting students from urban, suburban, and rural school districts with approximately 1/3 of their sample coming from each district. Students indicated whether good grades, athletic ability, or popularity was most important to them. They also ranked four factors: grades, sports, looks, and money, in order of their importance for popularity. The questionnaire also asked for gender, grade level, and other demographic information.

You want to compare the age of boys and girls. You choose to display a boxplot of the data.





  1. Open the DataBook summary.vstz
    open this data file via the Help / Open Examples menu; it is in the Sample Data
  2. Select the sheet PopularKids
  3. Choose the tab Statistics, the group Basic Statistics and the command Descriptives
  4. In Variables, select Age
  5. In Grouping Variables (optional), select Gender

  1. Click Charts page and check Boxplot of data
  2. Click OK



Report Window Output


Analysis Variable : Age
   Gender    N     Mean  Std Dev
      boy  227  10.5286   1.0100
     girl  251  10.3267   0.9407
  <total>  478  10.4226   0.9784

Chart Window Output




Interpreting the results

The means shown in the Report window and the boxplots indicate that the boys are older than the girls and associated data have a smaller spread.