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problemset3solution - PAM 2100 Instructor: Salam Abdus...

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PAM 2100 Instructor: Salam Abdus Problem Set #3 Answer Key (10 points total) #1) Student Prelim score Final exam score Student 1 114 56 Student 2 128 70 Student 3 130 78 a) What is the standard deviation of Prelim scores? Round your answer to two decimal places. (1 point) The standard deviation of the Prelim scores= 8.72 b) What is the standard deviation of Final Exam scores? Round your answer to two decimal places. (1 point) The standard deviation of the Final Exam scores= 11.14 c) What is the correlation coefficient between Prelim and Final Exam? 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 (1 point. A correct final answer gets full credit, showing work isn’t necessary. However, if the final answer is wrong but work shown is correct, give 80% credit) #2) A student wonders if tall women tend to date taller men than do shorter women. Here are the data (height in inches):

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This note was uploaded on 05/09/2009 for the course PAM 2100 taught by Professor Abdus,s. during the Spring '08 term at Cornell University (Engineering School).

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problemset3solution - PAM 2100 Instructor: Salam Abdus...

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