Almost all medical schools in the United States require students to take the Medical College Admission Test (MCAT). To estimate the mean score ? of those who took the MCAT on your campus, you will obtain the scores of an SRS of students. The scores follow a Normal distribution, and from published information you know that the standard deviation is 6.6 . Suppose that (unknown to you) the mean score of those taking the MCAT on your campus is 25 . In answering the following, usez-scores rounded to two decimal places.
If you choose one student at random, what is the probability (± 0.0001; that is round to a 4th decimal place) that the student's score is between 20 and 30?
You sample 28 students. What is the standard deviation (± 0.01, that is round to 2 decimal places) of sampling distribution of their average score x¯¯¯ ?
What is the probability (± 0.0001; that is round to a 4th decimal place) that the mean score of your sample is between 20 and 30?
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