Acollege professor claims that the entering class this year appears to be smarter than entering classes from previous years. he tests a random sample of of this year's entering students and finds that their mean iq score is , with standard deviation of . the college records indicate that the mean iq score for entering students from previous years is . if we assume that the iq scores of this year's entering class are normally distributed, is there enough evidence to conclude, at the level of significance, that the mean iq score, , of this year's class is greater than that of previous years?