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# e2p - Math 127A(Practice exam II The practice exam has 4...

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Math 127A (Practice exam II) October 13, 2010 The practice exam has 4 problems. It is about the same length as the actual exam. It does not represent every type of problem. 1. For the data given below compute the coefficent of correlation and draw the scatter diagram. x y 1 4 2 4 3 2 4 1 5 1 2. The table below gives the values of x and 5 possible choices of values for y (one choice per column). The third choice (C) has a correlation coefficient of 0 . 6. Compute the values of the correlation coefficients for the other choices (A, B, D, E). Explain your reasoning. If you believe that this can not be done in a simple way, then explain why. x choices for y A B C D E 1 1 5 2 3 3 2 2 4 3 3 1 3 3 3 1 3 2 4 4 2 5 3 5 5 5 1 4 3 4 3. Here is some information about the GPAs of business school graduates and their starting salaries. GPA Salary Average 3.0 \$85,000 Standard deviation 0.3 \$21,000 Correlation coefficient 0.4 You may assume the following: both GPAs and Salaries were normally distributed, the scatter diagram is football-shaped (Homoscedastic of you prefer), the chance error is normal.

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e2p - Math 127A(Practice exam II The practice exam has 4...

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