Most supermarkets use scanners at the checkout counters. The data collected this way can be used to evaluate the effect of price and store's promotional activities on the sales of any product. The promotions at a store change weekly, and are mainly of two types: flyers distributed outside the store and through newspapers (which may or may not include that particular product), and in-store displays at the end of an aisle that call the customers' attention to the product. Weekly data was collected on a particular beverage brand, including sales (in number of units), price (in dollars), flyer (1 if product appeared that week, 0 if it didn't) and display (1 if a special display of the product was used that week, 0 if it wasn't).

As a preliminary analysis, a simple linear regression model was done.

The fitted regression equation was: sales = 2259 - 1418 price.

The ANOVA F test p-value was .000, and R² = 59.7%.

Q:The response variable is (select all corrects)

Group of answer choices

A) Quantitative.

B) sales.

C) All of the above.

Flag question: Question 45Question 452 pts

Which of the following is the best interpretation of the slope of the line?

Group of answer choices

A) As the price increases by 1 dollar, sales will increase, on average, by 2259 units.

B) As the price increases by 1 dollar, sales will decrease, on average, by 1418 units.

C) As the sales increase by 1 unit, the price will increase, on average, by 2259 dollars.

D) As the sales increase by 1 unit, the price will decrease, on average, by 1418 dollars.

Flag question: Question 46Question 462 pts

Should the intercept of the line be interpreted in this case?

Group of answer choices

A) Yes, as the average price when no units are sold.

B) Yes, as the average sales when the price is zero dollars.

C) No, since a price of zero dollars is probably out of the range observed.

D) No, since sales of zero units are probably out of the range observed.

Flag question: Question 47Question 472 pts

The proportion of the variability in sales accounted for by the price of the product is

Group of answer choices

A) 14.18%.

B) 22.59%.

C) 59.70%.

D) 100%.