Math533 – course project – part c

Your Instructor will specify for you the dependent variable and the independent variables in your Case and data.  Using MINITAB perform the regression and correlation analysis for the data by answering the following.

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  1. Generate a scatterplot for the specified dependent variable and the specified independent variable, including the graph of the “best fit” line. Interpret.
  2. Determine the equation of the “best fit” line, which describes the relationship between the dependent variable and the selected independent variable.
  3. Determine the coefficient of correlation. Interpret.
  4. Determine the coefficient of determination. Interpret.
  5. Test the utility of this regression model (use a two tail test with the α provided by your Instructor). Interpret your results, including the p-value.
  6. Based on your findings in 1-5, what is your opinion about using the designated independent variable to predict the designated dependent variable? Explain.
  7. Compute the confidence interval for beta-1 (the population slope), using the confidence level specified by your Instructor.  Interpret this interval.
  8. Using an interval, estimate the average for the dependent variable for a selected value of the independent variable (to be provided by your Instructor). Interpret this interval.
  9. Using an interval, predict the particular value of the dependent variable for a selected value of the independent variable (to be provided by your Instructor). Interpret this interval.
  10. What can we say about the value of the dependent variable for values of the independent variable that are outside the range of the sample values? Explain your answer.

In an attempt to improve the model, we will attempt to do a multiple regression model predicting the dependent variable based on all of the independent variables.

  1. Using MINITAB run the multiple regression analysis using the designated dependent and independent variables.  State the equation for this multiple regression model.
  2. Perform the Global Test for Utility (F-Test). Explain your conclusion.
  3. 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. If any independent variables are to be discarded, re-run the multiple regression, including only the significant independent variables, and include the final Minitab output, with interpretation.
  4. Is this multiple regression model better than the linear model that we generated in parts 1-10? Explain.
  5. All DeVry University policies are in effect, including the plagiarism policy.
  6. Project Part C report is due by the end of Week 7.
  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 for report:

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

Project Part C: Grading Rubric

Category Points % Description
Questions 1 – 12 and 14 – 5 pts. each 65 65 addressed with appropriate output, graphs and interpretations
Question 13 15 15 addressed with appropriate output, graphs and interpretations
Summary 20 20 writing, grammar, clarity, logic, and cohesiveness
Total 100 100 A quality paper will meet or exceed all of the above requirements.

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