# MATH533 Project AJ Davis Department Stores PART C

Project Part C: Regression and Correlation Analysis

Using MINITAB perform the regression and correlation analysis for the data on CREDIT BALANCE (Y) and SIZE (X) by answering the following.

Generate a scatterplot for CREDIT BALANCE vs. SIZE, including the graph of the "best fit" line. Interpret. Determine the equation of the "best fit" line, which describes the relationship between CREDIT BALANCE and SIZE. Determine the coefficient of correlation. Interpret. Determine the coefficient of determination. Interpret. Test the utility of this regression model (use a two tail test with α =.05). Interpret your results, including the p-value. Based on your findings in 1-5, what is your opinion about using SIZE to predict CREDIT BALANCE? Explain. Compute the 95% confidence interval for . Interpret this interval. Using an interval, estimate the average credit balance for customers that have household size of 5. Interpret this interval. Using an interval, predict the credit balance for a customer that has a household size of 5. Interpret this interval. What can we say about the credit balance for a customer that has a household size of 10? Explain your answer.

In an attempt to improve the model, we attempt to do a multiple regression model predicting CREDIT BALANCE based on INCOME, SIZE and YEARS.

Using MINITAB run the multiple regression analysis using the variables INCOME, SIZE and YEARS to predict CREDIT BALANCE. State the equation for this multiple regression model. Perform the Global Test for Utility (F-Test). Explain your conclusion. Perform the t-test on each independent variable. Explain your conclusions and clearly state how you should proceed. In particular, which independent variables should we keep and which should be discarded. Is this multiple regression model better than the linear model that we generated in parts 1-10? Explain. All DeVry University policies are in effect, including the plagiarism policy. Project Part C report is due by the end of Week 7. Project Part C is worth 100 total points. See grading rubric below.

Summarize your results from 1-14 in a report that is three pages or less in length and explains and interprets the results in ways that are understandable to someone who does not know statistics.
Submission: The summary report + all of the work done in 1-14 (Minitab Output + interpretations) as an appendix.
Format:

Summary Report Points 1-14 addressed with appropriate output, graphs and interpretations. Be sure to number each point 1-14.

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