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STAT 3001 Week 3 Project Solution Correct Answers

Week 3 project answers for a statistics course.

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    1 STAT 3001 Week 3 Project Solution Correct Answers Student Name: <Type your name here> Date: <Enter the date on which you began working on this assignment.> Instructions: To complete this project, you will need the following materials:  STATDISK User Manual (found in the classroom in DocSharing)  Access to the Internet to download the STATDISK program. Part I. Analyze Data Instructions Answers 1. Open the file MOVIES using menu option Datasets and then Elementary Stats, 9 th Edition . This file con tains some information about a collection of movies. How many observations are there in this file? 2. Analyze the data in this file and complete the following table, indicating for each variable what type of data it represents. Variable Qualitative/ Quantitative Discrete/ Continuous / Neither Level of Measurement Rating Budget Gross Length Viewer 3. Would you consider this data to represent a sample or a population? Part II. ScatterPlots 4. Create a scatterplot for the data in the Budget and Gross columns. Paste it here. 5. Explain the visual relationship between Budget costs and Gross Earnings of the movies.

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    2 6. Create a scatterplot for the data in the Budget and the Viewe r Rating columns 7. Explain the visual relationship between Budget costs and Viewe r Rating. Part II I . Correlation 8. Find the linear correlation between the data in the Budget and Gross columns. 9. Explain the mathematical relationship between Budget costs and Gross Earnings of the movies based on the linear correlation coefficient. Be certain to include comments about the magnitude and the direction of the correlation 10. List the sample size and the degrees of freedom for this computation . 11. Find the linear correlation between the data in the Budget and Viewer Rating columns. 12. Compare and contrast these two relationships: BUDGET and GROSS BUDGET and RATING How are they similar? How are they different? [Hint: Read Page 290 “Types of Correlation”] Part IV . Simple Regression Let’s say that we wanted to be able to predict the GROSS earnings (in millions of dollars) for an upcoming movie based on the BUDGET (in millions of dollars) spent on the movie. Using this sample data, perform a simple - regression to determine the line - of - best fit. Use the BUDGET as your x (independent) variable and GROSS as your y (response) variable. 13. Paste your results here:

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    3 Answer the following questions related to this simple regression 14. What is the equation of the line - of - best fit? 15. What is the slope of the line? What does it tell you about the relationship between the BUDGET and GROSS data? Be sure to specify the proper units. [Hint: remember that both variables are measured in millions of dollars .] 16. What is the y - intercept of the line? What does it tell you about the relationship between the BUDGET and GROSS data ? 17. What would you predict for the GROSS earnings of a movie for which the BUDGET is 35 million dollars ? 18. Let’s say you run out of money making the movie and you have to reduce your BUDGET by 5 million dollars . What effect would you predict this would have on the GROSS earnings of the movie? 19. Find the coefficient of determination (R 2 value) for this data. What does this tell you about this relationship? [Hint: see definition on Page 311.]

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