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dix C . Data Sets 441 Chapter 15 Data Set 4 Hours of Study Grade 0 80 5 93 8 97 100 UT 75 W 83 4 98 OO 100 90 6 78 N330 Part V . More Statistics! More Tools! More Fun! TIME TO PRACTICE 1. When does the obtained chi-square value equal zero? Provide an example of how this might happen. 2. Using the following data, test the question of whether an equal number of Democrats, Republicans, and Independents voted during the most recent election. Test the hypothesis at the .05 level of significance. Do your calculations by hand. Political Affiliation Republican Democrat Independent 800 700 9004 . Use the data in Chapter 15 Data Set 4 to answer the questions below. 8. C Compute the correlation coefficient manually. Problem 4 a. Test for the significance of the correlation coefficient at the .05 level using a two-tailed test between hours of studying and grade. b. Interpret this correlation. What do you conclude about the rela- tionship between the number of hours spent studying and the grade received on a test? 8 c. How much variance is shared between the two variables? d. How do you interpret the results