Question

Let y = sales at a fast-food outlet (1000s of $), x1 = number of competing outlets within a 1-mile radius, x2 = population within a 1-mile radius (1000s of people), and x3 be an indicator variable that equals 1 if the outlet has a drive-up window and 0 otherwise. Suppose that the true regression model is

Y = 8.00 − 1.5x1 + 6.9x2 + 15.1x3 + ε

(a) What is the mean value of sales when the number of competing outlets is 3, there are 7000 people within a 1-mile radius, and the outlet has a drive-up window? (Round your answer to one decimal place.)

(b) What is the mean value of sales for an

Answer 1

(b) What is the mean value of sales for an outlet without a drive-up window that has two competing outlets and 5000 people within a 1-mile radius? (Round your answer to one decimal place.)

Answer 2

@hartnn

Answer 3

@hartnn

Answer 4

you know how to find the mean value with Y that is given?

Answer 5

i plugged those numbers in and got a number

Answer 6

48318.60

Answer 7

ε = ..?

Answer 8

What is epsalon?

Answer 9

I had a problem similar to this one and didn't plug a value in for epsolan

Answer 10

ok, so just assumed ε = 0

Answer 11

48318.60

Answer 12

you get the same? It's wrong

Answer 13

i got the same,
but is Y the actual mean?

can you post a screenshot on how the other similar problem was solved?

Answer 14

yeah give me a sec.

Answer 15

hold on it's taking forever to post my attachment

Answer 16

let me log off and back on...

Answer 17

I think the wifi i am using is bad. I can't post it.

Answer 18

no problem,
can you just describe how they did it?

Answer 19

Cardiorespiratory fitness is widely recognized as a major component of overall physical well-being. Direct measurement of maximal oxygen uptake (VO2max) is the single best measure of such fitness, but direct measurement is time-consuming and expensive. It is therefore desirable to have a prediction equation for VO2max in terms of easily obtained quantities. Consider the variables
y = VO2max (L/min)
x1 = weight (kg)
x2 = age (yr)
x3 = time necessary to walk 1 mile (min)
x4 = heart rate at the end of the walk (beats/min)
Here is one possible model for male students, consistent with the information given in the article "Validation of the Rockport Fitness Walking Test in College Males and Females"†:
Y = 5.0 + 0.01x1 − 0.05x2 − 0.13x3 − 0.01x4 + ε

σ = 0.4

Answer 20

1.73

Answer 21

(b) What is the expected value of VO2max when weight is 79 kg, age is 18 yr, walk time is 14 min, and heart rate is 134 b/m?

Answer 22

There is the question and my answer.

Answer 23

@Michele_Laino