Before Pet 
After Pet 

10 
15 

9 
9 

11 
10 

11 5 9 
19 17 15 
(a)
Before Pet  After Pet  Difference 
10  15  5 
9  9  0 
11  10  1 
11  19  8 
5  17  12 
9  15  6 
Mean  5  
Standard  4.89897949  
n  6  
t  2.5 
The test statistic is 2.5.
(b) The pvalue is 0.055.
Since the pvalue (0.055) is greater than the significance level (0.05), we cannot reject the null hypothesis.
(c) Cohen's d =5/4.89897949 = 1.02
(d) Since the pvalue (0.055) is greater than the significance level (0.05), we cannot reject the null hypothesis.
Therefore, we cannot conclude that people who never owned a pet are happier after getting a pet.
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