An independent-measures study comparing two treatment conditions with n = 6 in each sample produces t = 4.00.What is the value of r² for this study?
A)4/26
B)4/28
C)16/26
D)16/28

Question

Quizplus · Accepted Answer

To find r², we need to use the formula: t² / (t² + df), where df = n1 + n2 - 2. 
Substituting the given values, we get: 
r² = (4.00)² / [(4.00)² + (6+6-2)] 
r² = 16 / 26 
r² = 8 / 13 
Therefore, the answer is C.

An Independent-Measures Study Comparing Two Treatment Conditions with N =