Answers for all ‘Test Yourself’ questions from the book to check your performance and widen your overall understanding of the contents.

1.  
   
   1. 5/4, 1.25, 125%
   2. 1/5, .2, 20%
   3. 1/20, .05, 5%
2.  
   
   1. 4
   2. 10
   3. 3/10 = .3
   4.  9/10 = .9
3.  
   
   1. A pie chart, because the data is qualitative (name of salesperson), and the manager wants to see them as a proportion of total sales.
   2. A histogram, because psychological survey data is interval, which is quantitative.
   3. A scatterplot, because we are comparing two variables.
   4. A bar chart and frequency table, because the data is qualitative, and we are comparing different groups.
   5. A frequency polygon, because the data is quantitative, and he’ll be able to compare the polygon for Year 1 to the polygon from Year 2.