# Statistics final exam

Unit 6 [GB513: Business Analytics]

Unit 6: Final

This is your final. It is worth 250 points. You will prepare a PowerPoint presentation to present your

findings. This Assignment requires you to use Excel. Make sure you also submit the Excel file to

show your work. You will receive a 100-point deduction if you fail to include the Excel file

showing your work.

Place all calculations for each of the questions on a separate worksheet. Then, using the results of

your work from Excel, prepare PowerPoint slides to answer the questions in a presentation format.

All relevant content should be on the slides; do not use the notes section or leave information in

the Excel file. The executives reviewing the presentation should not need to switch to another

document to see the required information. The data you need is linked from the spreadsheet icon in

the course. Make sure to use that file.

Directions

For your final, you will be analyzing the “Colonial Broadcasting” case. Begin by reading the

description in the case. Then, answer the questions listed below, NOT the questions listed in the

case. Ignore everything in the case after the end of page 4.

The executives at CBC want to see how they are doing in ratings against the other networks and how

the ratings will continue to change in the upcoming months. They also want to know if hiring stars

makes a difference and the impact of fact-based programming compared to hiring stars. You will

create a PowerPoint presentation to answer the questions below. Remember that your audience is

the management of CBC. Therefore, make sure your presentation is professional and provides

sufficient explanation.

1. Answer the following questions: a. What is the average rating for all CBC movies? How about ABN movies and BBS

movies? b. Include a table that shows the average and the other descriptive statistics (using the

data analysis toolpack in Excel) for the ratings of the three networks (one column for each network). Explain what you learn from each of the metrics in the table.

c. Comment on which network is doing best.

2. Create a line graph of the monthly average ratings for CBC for the year. Note that there are multiple ratings data for the months; you will need to calculate an average for each month first, and then plot the averages. After you create the graph, fit a linear trend line, displaying the formula and the r-squared. Explain to the executives if you can use this time series data to forecast the ratings of upcoming months. How accurate can you expect this forecast to be?

3. Should the CBC hire stars for their movies? To answer this question, run a hypothesis test to see if there is a significant difference between the ratings of movies with stars versus movies without stars. Use the data for CBC movies only. Use 95% confidence. Answer the following:

a. What are the null and alternative hypotheses (state in full sentences)?

Unit 6 [GB513: Business Analytics]

b. Run the test using Excel and include the output table. Use a t-test assuming equal variances.

c. What is your recommendation to the executives? Justify your answer referring to the relevant figures.

4. Run a multiple regression where the dependent variable is ratings and the independent variables are star and fact. Use data from CBC only. CBC Management has several questions:

a. Which has more impact on a movie’s rating: Being fact-based or having one star? How much does each of these factors change the ratings?

b. How well does this regression analysis explain the ratings? Justify your answers referring to the relevant figures.

c. Are either, both, or neither of the independent variables significantly related to the ratings at 95% confidence? Justify your answers referring to the relevant figures.

Grading Rubric

Your Assignment will be graded based on the following grading criteria. Please study this table

closely and make sure you have covered all items.

Unit 6 Final

Content

Points

Possible

Points

Earned

Question 1

Correct average rating for all three networks 10

Question 1

Correct table showing the average and other descriptive statistics

for the ratings of the three networks, using one column for each

network

10

Question 1

Appropriate explanation and analysis of what is learned from each

of the metrics in the descriptive statistics table

20

Question 2

Correct line graph using the calculated average monthly ratings of

CBC for the year, showing r-squared and the formula

20

Question 2

Summary to executives regarding whether the linear forecast can

20

Unit 6 [GB513: Business Analytics]

be used to project ratings, including an assessment of how

accurate the forecast can be expected to be

Question 3

Correct null and alternative hypotheses stated in full sentences 20

Question 3

Accurate hypothesis test results 20

Question 3

Correct recommendation and justification for whether CBC should

hire stars

20

Question 4

Appropriate explanation on what has more impact on a movie’s

rating: Whether the movie includes a star or whether it is fact-based

20

Question 4

Explanation of how well this regression analysis explains the ratings 20

Question 4

Accurate identification and justification of which variables are

significantly related to ratings

20

PowerPoint is formatted appropriately and communicated clearly 50

Total 250

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