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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
Finland
1112
352
Great Britain
1147
467
United States
1283
191
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