problemset2solution - PAM 2100 Lecture 1 Spring 2009...

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PAM 2100 Lecture 1 Spring 2009 Instructor: Salam Abdus Problem Set #2 Answer key Total Points: 10 Circle all of your final answers. Put your name and your section number at the top. #1) The mean of a distribution x is 11 and the standard deviation of x is 7. The distribution x is linearly transformed such that x new = 6x. What is the mean of x new ? What is the standard deviation of x new ? (2 points) Ans. The mean of x new is (6)(11)=66. The standard deviation of x new is (6)(7)=42 (Correct final answers receive full credit. However if the final answer is wrong but the formulas used were correct, give 80% credit) #2) The mean of a distribution x is 10 and the standard deviation of x is 4. The distribution x is linearly transformed such that x new = a + bx. The mean of x new is 35 and standard deviation of x new is 12. Suppose b is a positive number. What does a equal? What does b equal? (2 points) Mean(x)=10, s.d.(x)=4. 35
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problemset2solution - PAM 2100 Lecture 1 Spring 2009...

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