Question 13 4 pts Do ESL students score lower in English college placement tests than the national average? A researcher obtained the English placement test scores of a random sample of 53 ESL students. He finds that the mean score of these 53 students is 147.9. Is this significantly different from the national average (M = 150, o = 15)? Which test is appropriate for this study? O two-tailed z-test O one-tailed t-test O two-tailed t-test O one-tailed z-test 4 Previous Next