Discussion Topic Due Day 3 Respond to the following in a minimum of 175 words: Models help us describe and

Discussion Topic

Due Day 3

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.
• Do you observe a relationship between both variables?
• 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.)
• What is the slope? What does the slope tell us?Is the      slope significant?
• What is the intercept? Is it meaningful?
• What is the value of the regression coefficient,r? What      is the value of the coefficient of determination, r^2? What does r^2 tell  us?
• Use the model to predict sales and the business spends      $950,000 in advertisement. Does the model underestimate or overestimates      ales?