Steve Sawin
MA 217
Quiz Lecture 11 – Linear Regression
You are interested in how temperature affects your use of fuel oil. You randomly select
40 days during the winter and record the average daily temperature in Farenheit and the
gallons of heating oil your house consumes over the course of the day, The least squares
line for you data was
y = 17.5 − .29x
and you find that r2 = .897.
1.
[2pt]
Underline the phrase above describing the variable that x represents. It is the
(circle one)
explanatory / response
variable.
2.
For each additional degree Farenheit the temperature rises, you can expect to
(circle one) more / fewer gallons of oil on that day
use
on average.
3.
[3pt]
4.
[2pt]
[3pt]
Interpret the number 17.5 in terms of temperatures and fuel oil.
% of the variation in
relationship with temperature.
can be explained by its linear