problemset3solution

problemset3solution - PAM 210 Lecture 1 Instructor Salam...

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PAM 210 Lecture 1 Instructor: Salam Abdus Problem Set #3 Posted: February 11 th , 2008 Due: February 18 th , 2008 #1) Student IQ score Self-concept score Student 1 114 56 Student 2 128 70 Student 3 130 78 a) What is the standard deviation of IQ scores? Round your answer to two decimal places. The standard deviation of the IQ scores= 8.72 ( 10 points) b) What is the standard deviation of self-concept scores? Round your answer to two decimal places. The standard deviation of the self-concept scores= 11.14 (10 points) c) What is the correlation between IQ and self-concept? Use the numbers you rounded to two decimal places in parts a and b. Round your final answer to two decimal places. 97 . 0 )] 14 . 11 68 78 )( 72 . 8 124 130 ( ) 14 . 11 68 70 )( 72 . 8 124 128 ( ) 14 . 11 68 56 )( 72 . 8 124 114 [( 2 1 ) )( ( 1 1 1 - - + - - + - - = - - - = = y i n i x i s y y s x x n r (10 points. Students do not have to show this formula. A correct final answer gets full credit) #2) A student wonders if tall women tend to date taller men than do shorter women. Here are the data (height in inches): women (x) 66 64 66 65 70 65 men (y) 72 68 70 68 71 65 The correlation r = 0.57 (rounded to two decimals).
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a) Would r change if all the men were 6 inches shorter than the heights given in the table? Yes or no?
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problemset3solution - PAM 210 Lecture 1 Instructor Salam...

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