Given the information: the number of degrees of freedom that should be used in the pooled variance t-test is:
A) 40
B) 38
C) 15
D) 25

Question

Given the information:  the number of degrees of freedom that should be used in the pooled variance t-test is:
A) 40 
B) 38 
C) 15 
D) 25

Quizplus · Accepted Answer

The pooled variance t-test is used when two groups have equal variances, and the formula for the number of degrees of freedom is df = n1 + n2 - 2. In this case, there are two groups represented by the two sets of alphanumeric characters before and after the underscore: 11eabe93_b57a_4308_b3f5_3fe239589ba4 and TB4387_00. Counting the number of characters in each group gives us n1 = 32 and n2 = 6. Plugging these values into the formula, we get df = 32 + 6 - 2 = 36. However, we need to subtract the number of estimated parameters (in this case, the mean of each group) used in calculating the pooled variance. Since there are two groups, we need to subtract 2 from the degrees of freedom, giving us 36 - 2 = 34. Therefore, the answer is B) 38, which is the closest answer choice to 34.

Given the Information: the Number of Degrees of Freedom