tTest: TwoSample Assuming Equal Variances 

Variable 1 
Variable 2 

Mean 
80.471 
76.846 
Variance 
97.51 
162.14 
Observations 
17 
13 
Pooled Variance 
125.21 

Hypothesized Mean Difference 
0 

df 
28 

t Stat 
XXX 

P(T<=t) onetail 
0.1934 

t Critical onetail 
XXX 

P(T<=t) twotail 
0.3868 

t Critical twotail 
XXX 
C. Fail to reject the null hypothesis, conclude there is insufficient information to decide there is a difference between the grades of the morning class and the grades of the evening class.
Explanation:
The Pvalue for the test is given as 0.3868 for the two tailed test which is greater than the alpha value 0.05, so we do not reject the null hypothesis. There is sufficient evidence to conclude that there is no difference between the grades of the morning class and the grades of the evening class. In other words, there is insufficient information to decide there is a difference between the grades of the morning class and the grades of the evening class.
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