A study on the oxygen consumption rate (OCR) of sea cucumbers involved a random sample of size 10 at 15oC and a second random sample of size 7 kept at 18oC. If one tested the hypothesis that this range
Of temperature had no effect on the OCR, the degrees of freedom for the test statistic would be (assume
Equal variability)
A) 9
B) 10
C) 15
D) 16

Question

Quizplus · Accepted Answer

The degrees of freedom for an independent samples t-test with equal variances is calculated by: df = n1 + n2 - 2. Substituting in the values, we get df = 10 + 7 - 2 = 15. Therefore, the correct choice is C.

A Study on the Oxygen Consumption Rate (OCR) of Sea