The following data represent a company's yearly sales volume and its advertising expenditure over a period of 8 years. 
a. Develop a scatter diagram of sales versus advertising and explain what it shows regarding the relationship between sales and advertising.
b. Use the method of least squares to compute an estimated regression line between sales and advertising.
c. If the company's advertising expenditure is $400,000, what are the predicted sales? Give the answer in dollars.
d. What does the slope of the estimated regression line indicate?
e. Compute the coefficient of determination and fully interpret its meaning.
f. Use the F test to determine whether or not the regression model is significant at = 0.05.
Definitions:
Incontinence
Incontinence is the inability to control the voluntary evacuation of urine or feces, affecting individuals' quality of life and requiring management strategies.
Indwelling Catheter
A catheter that is left inside the body for continuous urine drainage, typically inserted into the bladder.
Dependent Loops
The sections of tubing or catheters that hang below the level of the patient's bladder or point of insertion, which can lead to backflow and increased risk of infection.
Collection Bag
A container used to collect bodily fluids or waste, such as urine or surgical drainage, directly from the body or a medical device.
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