Imagine the average time to complete a 4-year bachelor degree is actually 4.7 years based on national data.You collect data on the 68 psychology students who started school during the same semester as you, finding an average time to complete at 4.3 years with a standard deviation of 0.6 years.What would be the effect size associated with a single-sample t test?
A) -5.48
B) -0.67
C) 0.20
D) 0.82

Question

Quizplus · Accepted Answer

The formula for effect size for a single-sample t test is:

d = (M - μ) / s

where d is the effect size, M is the sample mean, μ is the population mean, and s is the standard deviation of the sample.

Plugging in the values from the question, we get:

d = (4.3 - 4.7) / 0.6 = -0.67

Therefore, the effect size associated with a single-sample t test is -0.67.

Imagine the Average Time to Complete a 4-Year Bachelor Degree