1. Is wine good for your heart? The table below gives data on yearly wine consumption (litres of alcohol from drinking wine, per person) and yearly deaths from heart disease (deaths per 100,000 people) in19 developed countries in 2001.

Country	Alcohol from Wine	Heart Disease Rate	Country	Alcohol from Wine	Heart Disease Rate
Australia	3.25	80	Italy	7.5	60
Austria	4.75	100	Netherlands	2.75	70
Belgium	2.75	60	New Zealand	2.5	100
Canada	1.5	80	Norway	1.75	80
Denmark	4.5	90	Spain	5	50
Finland	3	120	Sweden	2.5	90
France	8.5	40	Switzerland	6	70
Germany	3.75	90	United Kingdom	2.75	120
Iceland	1.25	110	United States	1.25	120
Ireland	2	130

1. A study showed that drinking moderate amounts of wine may help prevent heart attacks. The regression results are given below:

SUMMARY OUTPUT
Regression Statistics
Multiple R	0.645
R Square	0.416
Adjusted R Square	0.382
Standard Error	20.108
Observations	19.000
ANOVA
	df	SS	MS	F	Significance F
Regression	1.000	4894.503	4894.503	12.105	0.003
Residual	17.000	6873.918	404.348
Total	18.000	11768.421
	Coefficients	Standard Error	t Stat	P-value	Lower 95%	Upper 95%	Lower 95.0%	Upper 95.0%
Intercept	115.861	9.399	12.327	0.000	96.030	135.691	96.030	135.691
Alcohol from Wine	-8.050	2.314	-3.479	0.003	-12.931	-3.168	-12.931	-3.168

1. Write down the least-squares regression line.
2. Interpret the slope of the least-squares regression line.
3. Could we use the least-squares regression line to predict the heart disease death rate for a country where wine consumption is 150 litres of alcohol per person? Explain.
4. How much of the variation in the heart disease death rate can be explained by wine consumption?
5. Suggest some differences among nations that may be confounded with wine-drinking habits.