Zagat restaurant guides publish ratings of restaurants for many
large cities around the world. The restaurants are rated on a 0 to
30 point scale based on quality of food, decor, service, and cost.
Suppose the regression equation that predicts the cost of dinner
using the rating of the quality of food for the restaurants in a
particular city is (cost of dinner) = 4.089*(food quality) + 2.371.
Interpret the slope.
1)
We are not given the dataset, so we cannot make an
interpretation.
2)
When cost of dinner increases by 1 dollar, food quality
increases by 4.089 points.
3)
When food quality increases by 1 point, cost of dinner
increases by 2.371 dollars.
4)
When food quality increases by 1 point, cost of dinner
increases by 4.089 dollars.
5)
When cost of dinner increases by 1 dollar, food quality
increases by 2.371 points.
Suppose that for a typical FedEx package delivery, the cost of
the shipment is a function of the weight of the package. You find
out that the regression equation for this relationship is (cost of
delivery) = 0.75*(weight) + 6.21. If a package you want to ship
weighs 26 ounces and the true cost of the shipment is $12.13, what
is the residual?
1)
13.87
2)
0.29
3)
13.58
4)
-13.58
5)
-13.87
Zagat restaurant guides publish ratings of restaurants for many
large cities around the world. The restaurants are rated on a 0 to
30 point scale based on quality of food, decor, service, and cost.
Suppose the regression equation that predicts the cost of dinner
using the rating of the quality of food for the restaurants in a
particular city is (cost of dinner) = 3.605*(food quality) + 2.713.
If a restaurant in the city was given a Zagat rating of 25.683, and
the average cost of dinner there is 57.626, the residual is
-37.674. Interpret the residual.
1)
The Zagat rating is 37.674 points larger than what we would
expect.
2)
The cost of dinner is 57.626 dollars less than what we would
expect.
3)
The Zagat rating is 37.674 points less than what we would
expect.
4)
The cost of dinner is 37.674 dollars less than what we would
expect.
5)
The cost of dinner is 37.674 dollars greater than what we would
expect.