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section_problems_3_fall11

section_problems_3_fall11 - 1 Section Problems#3#1 Student...

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1 Section Problems #3 #1) Student IQ score Self-concept score Student 1 110 58 Student 2 124 72 Student 3 126 83 a) What is the standard deviation of IQ scores? Round your answer to two decimal places . b) What is the standard deviation of self-concept scores? Round your answer to two decimal places . c) What is the correlation between IQ and self-concept? Use the standard deviations that you rounded to two decimal places in parts a and b . Round your final answer to two decimal places . 2. Consider the sample data in the following table: Student Math Score Econ Score Student 1 9 8 Student 2 10 24 Student 3 11 28 What is the covariance between Math scores and Econ scores? 3. Data is collected for ten couples. X i measures the height of the i th woman, and Y i measures the height of the i th woman’s boyfriend. The correlation between X and Y is calculated to be exactly 1 . One _____ conclude from this information that all ten of the women in the sample have boyfriends who are taller than themselves.
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