Stat 101 L
Quiz 6
Name: ___Answer Key____________
There is some indication that consumption of moderate amounts of wine can help prevent
heart attacks. Yearly wine consumption (liters of alcohol from drinking wine, per
person) and yearly death rates from heart disease (deaths per 100,000 people) are
obtained for a random sample of 9 European countries.
300
Death Rate
250
RSquare
RSquare Adj
Root Mean Square Error
Mean of Response
Observations (or Sum Wgts)
200
150
100
0.611942
0.556506
41.1916
161.1111
9
50
0
0
1
2
3
4
5
6
7
8
9
10
Wine Consumption
Linear Fit
Predicted Death Rate = 245.95424 – 21.389025*Wine Consumption
a) Answer the questions Who? And What?
Who? European countries.
What? Wine consumption (liters of alcohol from wine)
Death rate from heart disease (rate per 100,000)
b) Give an interpretation of the estimated intercept within the context of the
problem.
If a country consumes no alcohol from wine, the predicted death rate from
heart disease is 245.95 deaths per 100,000.
c) Give an interpretation of the slope within the context of the problem.
For each additional 1 liter of alcohol from wine a country consumes, the
death rate from heart disease decreases by 21.39 deaths per 100,000.
d) What is the value of the correlation coefficient, r?
r = − RSquare = − 0.6119 = −0.782