# Answers to Homework 3 - Answers to Homework 3 Chap 3: 25 &...

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Answers to Homework 3 26. a) Median (a few extreme scores would distort the mean. b) Mode (nominal scale) c) Mean 28. a) b) (-2) + (-1) + 0 + 0 +1 + 2 + 2 + 2 + 3 + 3 + 4 + 4 + 4 + 4 + 5 + 5 + 6 + 7 + 7 =59 = 2.95 20 20 c) Yes, the pain level was higher before treatment for nearly all participants 2. a) SS is the sum of squared deviation scores b) Variance is the mean squared deviation (how spread out the scores are) c) Standard deviation is the square root of the variance. It provides a measure of the standard distance from the mean. 3. It would likely be within 20 units of the mean because the standard deviation (which is 20) measures the standard distance between a score and the mean. 5. A standard deviation of zero means there is no variability among scores. In this case, all of the scores in the sample have exactly the same value.

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7. a) To find standard deviation: M = 3+3+5+1+4+3+2+3/8 = 24/8 = 3 X X-M (X-M) 2 3 0 0 3 0 0 5 2 4 1 -2 4 4
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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 3 - Answers to Homework 3 Chap 3: 25 &...

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