Suppose a group of researchers are interested in studying average mental health scores on a college campus (the quality of mental health, on average, of college students). Scores are given on a scale of 0 (the worst possible mental health) to 100 (the best possible mental health). Prior research (10 years ago) indicates an average score in the population of 75 with a standard deviation of 18, but the researchers are interested in knowing whether the mean has changed over the years. Researchers collected a sample of 100 college students. All the scientists are interested in testing the hypothesis that the MH scores have changed. They get a sample mean of 75, using an alpha of .05 two-tailed. What type of t test will you conduct? How do you know it will be the correct one