# e1 - Math 127A Exam 1 The exam has 4 problems The number of...

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Math 127A Exam 1 September 22, 2010 The exam has 4 problems. The number of points is indicated. In order to receive full credit you must provide justiﬁcation for your answer. Question Points possible Points 1 20 2 40 3 80 4 60 Total 1

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1. The department of education commissions a study into the relationship between family income and SAT scores. (a) Suggest two possible confounding factors. Explain why they are confounding. [ 15 points] (b) Is this an observational study or a controlled experiment? [ 5 points] 2
0 . 4. There are 5500 students in the graduating class. (a) Sketch a normal curve for GPA scores. Indicate clearly the location of the points that are 1 and 2 standard deviations from the average. [ 15 points] (b) In order for a student to be considered for the Dean’s list they must have a GPA of 3.6 or higher. How many students in the graduating class are eligible for the Dean’s list. [

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e1 - Math 127A Exam 1 The exam has 4 problems The number of...

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