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Discussion Topic
Respond to the following in a minimum of 175 words:
Models help us describe and summarize relationships between variables. Understanding how process variables relate to each other helps businesses predict and improve performance. For example, a marketing manager might be interested in modeling the relationship between advertisement expenditures and sales revenues.
Consider the dataset below and respond to the questions that follow:
Advertisement ($’000) Sales ($’000)
1068 4489
1026 5611
767 3290
885 4113
1156 4883
1146 5425
892 4414
938 5506
769 3346
677 3673
1184 6542
1009 5088
Construct a scatter plot with this data using Excel (Attach the excel page).
Do you observe a relationship between both variables? (Post your response in Blackboard).
Use Excel to fit a linear regression line to the data. What is the fitted regression model? (Hint: You can follow the steps outlined on page 497 of the textbook.) (Should be on the same Excel page).
What is the slope? What does the slope tell us? Is the slope significant? (Post your response in Blackboard).
What is the intercept? Is it meaningful? (Post your response in Blackboard).
What is the value of the regression coefficient? What is the value of the coefficient of determination, r^2? What does r^2 tell us? (Post your response in Blackboard).
Use the model to predict sales and the business spends $950,000 in the advertisement. Does the model underestimate or overestimate sales? Justify your answer. (Post your response in Blackboard).
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