While researching lifestyle changes to improve heart health, you come across a research article reporting that the average American consumes about2700 caloriesper day ( = 2700). You come across another article that refutes this,statingthat a sample of Americans consumed significantly less than thismeanon average,t (50) = 2.993, p,0.05, r^2 = 0.15. Assuming this test was a one-sample t-test, answer the following questions:

a. Is this a significant effect?

b. What is the proportion of variance for this effect?