The president of a university claimed that the entering class this year appeared to be larger than the entering class from previous years but their mean SAT score is lower than previous years. He took a sample of 20 of this year's entering students and found that their mean SAT score is 1,501 with a standard deviation of 53. The university's record indicates that the mean SAT score for entering students from previous years is 1,520. He wants to find out if his claim is supported by the evidence at a 5% level of significance. What is the population the president is interested in? A. all entering students to all universities in the U.S this year B. the SAT scores of all students entering universities in the U.S. this year OC. all entering students to his university this year OD. all SAT test centers in the U.S. this year