STAT 20 Study Guide - Quiz Guide: Normal Distribution, Standard Deviation, Scatter Plot
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STAT 20 Full Course Notes
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Please write your name below and circle your section. This quiz covers material from homeworks 3 and 4. Part 1 for questions 1-2, show all work and put a box around your answer. Use the provided normal table on the back if needed: for freshmen at uc berkeley, the average gpa is 3. 0; the sd is 0. 5. Estimate the 45th percentile of the gpa distribution. From normal table, when central area is 10%: For 11. 92%: z = -0. 15 z = (obs exp)/sd. Using 7. 97%, z = -0. 10, 45th percentile = 2. 95 would not get full credit. For the average of 7. 97% and 11. 92%: z = (-0. 10 + -0. 15)/2 = -0. 125 z = (obs exp)/sd. 45th percentile = 2. 9375: for graduating seniors at uc berkeley, the average gpa is 2. 9. 1 pt. for correct answer with work shown (as below or drawing the normal curve, etc). From normal table, when central area is 70%:
