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Quiz 3 Sp10

# Quiz 3 Sp10 - Quiz 3 Statistics 21 Spring 2010 Ibser For...

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Quiz 3 Statistics 21 Spring 2010 Ibser For all parts of this quiz where you are asked to explain, use relevant statistical terms for full credit. 1) Last semester, a mathematics class held a midterm and a final. The average score for the midterm was 70 with an SD of 10. The correlation between the midterm score and the final score was .6. Assume that the scatter diagram is football-shaped and that scores on both exams are continuous. a) Of the students who scored 50 points on the midterm, how many scored below the 4th percentile on the final? For parts b) and c), suppose further that the scores for the final had an average of 50 with an SD of 10. b) Of the students who scored 50 points on the midterm, about what percentage received a higher score on the final than the midterm? c) Suppose that, to receive an A in the class, a student needs the sum of their midterm and final scores to be at least 160. A friend of yours, who took this class last semester, claims to have received an A in the class. You also know that your friend scored an 80 on the

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