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

1.  
   
   1. r = +0.7 (actual: +0.80)
   2. r = -0.5 (actual: -0.49)
2.  
   
   1. -.80
   2. 1.00
   3. -1.00
   4. Neither: they’re equally strong!
3.  
   
   1. Yes; sales is ratio-level measurement while the ratings are interval
   2. No; sales is ratio-level measurement while the ratings are ordinal
   3. Yes; sales and number of purchases are both ratio
   4. No; ratings are interval while colour is nominal
4. Given this result from a Pearson’s correlation: r(30) =+ .02, p > .05
   
   1. 32
   2. .05
   3. 2.042
   4. Positive
   5. .11
   6. No, the relationship was not statistically significant.