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The president of a university claimed the mean college entrance exam score is lower than previous years. He took a sample of 20 of this year's entering students and found that their mean college entrance exam score is 1501 with a standard deviation of 53. The university's record indicates that the mean college entrance exam score for entering students from previous years is 1520. To test the president's claim at a 5% level of significance, what are the null and alternative hypotheses? Ha and H1 are referred to an alternative hypothesis. OHo : M 2 1520 versus Ha : u 1501 OHo : u 1501 OHo : u = 1520 versus Ha : u # 1520 ONONE OF THESE ALTERNATIVES IS CORRECT