While researching lifestyle changes to improve heart health, you come across a research article reporting that the average American in the population consumes about 2,700 calories per day. 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) = 2.993, p < .05 (η2 = 0.15). Based on the information provided, answer the following questions:
(a) Does the test statistic show a significant effect?
(b) What is the proportion of variance for this effect?