Statistics Solutions

(Step-by-Step) Scores for men on the verbal portion of the SAT-I test are normally distributed with a mean of 509 and a standard deviation of 112. Randomly

Question: Scores for men on the verbal portion of the SAT-I test are normally distributed with a mean of 509 and a standard deviation of 112. Randomly selected men are given the Columbia Review Course before taking the SAT test. Assume that hte course has no effect.

  1. If 1 of the men is randomly selected, find the probability that his score is at least 590.
  2. If 16 of the men are randomly selected, find the probability that their mean score is at least 590.
  3. In finding the probability for part (b), why can the central limit theorem be used even though the sample size does not exceed 30?
  4. If the random sample of 16 men does result in a mean score of 590, is there strong evidence to support the claim that the course is actually effective? Why or why not?

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