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

1.  
   
   1. Bad; we can’t test for “the same”
   2. Bad; this is not specific – better than when?
   3. Good
2.  
   
   1. One-tailed, “more”
   2. Two-tailed, “different”
   3. One-tailed, “increase”
3.  
   
   1. No, .02 > .01
   2. No, .06 > .05
   3. Yes, .06 < .10
4.  
   
   1. Retain the null.  The difference is not statistically significant.  There is insufficient evidence to conclude that women have more fun than men at our store.
   2. Reject the null and accept the alternative.  The difference is statistically significant.  Employee retention is different between branches.
   3. Reject the null.  The difference is statistically significant.  Sales increased after sales training.
5.  
   
   1. H₁: μ ≠ 10
   2. H₁: μ < 0
   3. H₁: μ > 15
6.  
   
   1. H₀: μ ≤ -10
   2. H₀: μ = 60
   3. H₀: μ ≥ 100
7. You are more likely to reject the null is α = .10 because the region of rejection is larger (10% of the sampling distribution described by the null instead of 5%).
8. ξ = .02, p > .05