# Answers to Homework 4 - Answers to Homework 4 Pg 134-135 19...

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Answers to Homework 4 19. a) b) Mean is probably 5 (the middle of the distribution) SD is probably somewhere between 0 and 3 because the farthest points on the graph are 3 points away. c) To find standard deviation: M = 8+6+2+6+3+5/6 = 30/6 = 5 X X-M (X-M) 2 8 3 9 6 1 1 2 -3 9 6 1 1 3 -2 4 5 0 0 24 SS / N = variance variance = SD 24/6 = 4 4 = 2 22. a) b) Mean is probably around 6 or 7. SD is probably somewhere between 0 and 6 c) To find standard deviation: M = 12+1+10+6+3+3+7/7 = 42/7 = 6 X X-M (X-M) 2 12 6 36 1 -5 25 10 4 16 6 0 0 3 -3 9 3 -3 9

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7 1 1 96 SS / (n-1) = variance variance = SD 96/(7-1) = 16 16 = 4 25. To find standard deviation: M = 4+ 0+1+1/4 = 6/4 = 1.5 X X-M (X-M) 2 4 2.5 6.25 0 -1.5 2.25 1 -0.5 0.25 1 -0.5 0.25 9 SS / (n-1) = variance variance = SD 9/4-1 = 3 3 = 1.73 2. a) 4/8 = 0.5 c) -8/8 = -1 3. a) Z = X μ 2 = X 2*4 = X X = 8 8 points above the mean
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## This note was uploaded on 01/15/2010 for the course PSYC 331 taught by Professor Dianealonso during the Fall '09 term at UMBC.

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Answers to Homework 4 - Answers to Homework 4 Pg 134-135 19...

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