Exam 2-08 - Solutions

Exam 2-08 - Solutions - Math 253 Exam #2 Spring 2008 Dr....

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Math 253 – Exam #2 Spring 2008 – Dr. Weaver 1. Given the following data set, calculate the correlation coefficient using the z-scores.  Show the  z-scores in the extra columns of the table, as well as the results of any other intermediate  calculations that you have the calculator do.  (The idea here is that you show that you know  how to do all the steps in the calculation so that you could do it with a very simple  calculator.)   LABEL EVERYTHING!!! x y z x z y z x  * z  z Σ x  *  z r 22 4 -0.12 -0.75 0.09154     17 3 -0.44 -0.84 0.37467     40 21 1.03 0.91 0.94606 7     5 1 -1.22 -1.04 1.26287 5     37 16 0.84 0.43 0.35868 6 9.34 0.934 19 8 -0.32 -0.36 0.11209     23 14 -0.06 0.23 - 0.01349     6 3 -1.15 -0.84 0.97118 3     7 3 -1.09 -0.84 0.91695 4     53 31 1.87 1.89 3.53704 7     34 24 0.65 1.21 0.78338 1     mean =  23.9 11.6 std dev  15.6 10.2
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2. The table shows oil production in the US at 5 year intervals. There are two different time periods with different trends and regression lines. Separate the data into those two time periods and find a regression line for each one. Use the calculator to find both regression lines and give the equations of both lines. Also list the residuals for the both periods in the table below. LABEL EVERYTHING
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This note was uploaded on 05/02/2008 for the course MATH 253 taught by Professor Weaver during the Spring '08 term at Idaho State University.

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Exam 2-08 - Solutions - Math 253 Exam #2 Spring 2008 Dr....

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