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

1.  
   
   1. df = 5
   2. df = 9
   3. df = 28
   4. df = 1
2.  
   
   1. χ²_crit =  7.815
   2. χ²_crit =  11.345
   3. χ²_crit =  12.592
   4. χ²_crit =  58.619
3.  
   
   1. 3
   2. .05
   3. 5.991
   4. No, the results were not statistically significant.
4. A researcher selects a sample of 40 people to investigate the relationship between brand preference (Brand A or Brand B) and gender (male or female). Of the 20 males in the sample, 5 prefer Brand A.  Of the 20 females in the sample, 12 prefer Brand A. Based on the information in this scenario:
   
   1. 8.5
   2. 11.5
   3. 8
   4. 5