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Unformatted text preview: o be 0.8 then what must be the covariance between X and Y? b. (4 points) What are the units of the covariance? c. (4 points) Suppose we wanted both scores to be as a percentage of the perfect scores in each test. What transformations would we need to apply to achieve this for each variable? d. (4 points) Find the mean and variances of the transformed variables. e. (4 points) Find the covariance and correlation between the transformed variables. 3. (12 total) Professor Donald has a collection of heavy metal songs on his ipod. He has 20 songs by Metallica, 15 songs by Megadeth and 10 songs by Black Sabbath. He decides to play his ipod in shuffle mode whereby songs are randomly selected from his collection. Professor Donald only has time to listen to 6 songs. For the following you just need to write down the appropriate formula and you do not have to do the numerical calculation. a. (3 points) If there are no repeats how many different combinations of songs are possible? b. (3 points) If there ar...
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This test prep was uploaded on 03/25/2014 for the course ECO 329 taught by Professor K during the Spring '08 term at University of Texas at Austin.
- Spring '08