Question: 1. What percent of variance in common do two variables have if their correlation is .10? What if the correlation is quadrupled to .40?
2. For each of 11 countries, the accompanying table gives the cigarette consumption per capita in 1930 and the male death rate from lung cancer 20 years later in 1950 (Doll, 1955; reprinted in Tufte, 2001). Calculate a Pearson r and write a statement telling what the data show.
|
Country
|
Per capita cigzurne
consumption
|
Male death rate
(per million)
|
|
Iceland
|
217
|
59
|
|
Norway
|
250
|
91
|
|
Sweden
|
308
|
113
|
|
Denmark
|
370
|
167
|
|
Australia
|
455
|
172
|
|
Holland
|
458
|
243
|
|
Canada
|
505
|
150
|
|
Switzerland
|
542
|
250
|
|
Finland
|
1112
|
352
|
|
Great Britain
|
1147
|
467
|
|
United States
|
1283
|
191
|