While researching lifestyle changes to improve heart health, you come across a research article reporting that the average American consumes about 2,700 calories per day (μ = 2,700).

Question

You come across another article that refutes this, stating that a sample of Americans consumed significantly less than this mean standard on average, t(50) = 3.363, p < 0.05 (η2 = 0.18). Assuming this test was a one-independent sample t-test, answer the following questions.

A)  What is the proportion of variance for this effect? (Round your answer to two decimal places.)

Answer 1

Eta-squared () is a measure of effect size or proportion of variance. In this case it is equal to 0.18 or 18%.