Question

A researcher examines the influence of marital counseling on individuals' romantic relationship satisfaction. One group of 20 married individuals participates in marriage counseling, while a second group of 20 married individuals receives no counseling. After 2 months, each participant reports on their relationship satisfaction. For the participants receiving counseling, their mean satisfaction was 9.1. The mean satisfaction for participants who received no counseling was 6.8. The pooled variance was 38.

What is the Cohen's d for this example?

Be sure to round to two decimal places for each calculation step and final answer submission.

Answer 1

Answer:The Cohen's d is 0.37

Explanation: Cohen's d is a difference used to determine the standard differences between two mean.

The Cohen's d formula is

d = (M1 - M2) ÷ Spooled ......(1)

M1 is the mean satisfaction of the first group = 9.1

M2 is the means satisfaction of the second group = 6.8

Spooled is the standard deviation pooled.

STEP1: Find Spooled

In statistics, the square root of variance gives standard deviation.

Therefore;

Standard pooled = √variance pooled

Spooled = √38 = 6.16

STEP2: Find Cohen's d

Using equation one

(9.1 - 6.8) = 2.3

2.3 ÷ 6.16 = 0.37

Therefore the Cohen's d for the research is 0.37