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 (μ = 150, σ = 15)? Which test is appropriate for this study? Group of answer choices two-tailed z-test one-tailed z-test one-tailed t-test two-tailed t-test

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A: Solution:

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