Module 5 Homework Assignment The paired data below consists of test scores and hours of preparation for 5 randomly selected students. Use this data set to answer the questions below: Hours of preparation529610 y Test score 6448727380 1. Use the given data to find the correlation coefficient r, regression equation and scatter plot in MS Excel.

Solution: 2. Based on the linear correlation coefficient r, is this a good model? Explain. Solution: 3. What is the best-predicted test score for a student who spent 7 hours preparing for the test? Solution: 4. Find the standard error. Use formula or MS Excel. Solution: 5. Find the 99% prediction interval for the test score of a person who spent 7 hours preparing for the test given that E=34.677. Interpret the result.

Solution: 6. Find the explained variation. Solution: 7. Find the unexplained variation. Solution: 8. Find the total variation. Solution: 9. Find the value of r2 and explain its meaning. Solution: 10. If the data point ( 3, 100) is added to the data set, how would this affect the results of the regression analysis? Is this data point an outlier, an influential point or both?

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