A college 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? Perform a one-tailed test. Then fill in the table below
