The data sets in Exercises 11 are known to be linear.
The total value of the goods and services produced by a nation is called its gross domestic product or GDP. The GDP per capita is the ratio of the GDP for a given year to the population that year, and is one of many indicators of economic health. The GDP per capita (in $1000s) for the United States is shown in the table for selected years. (a) Draw a scatterplot using scales that appropriately fit the data, then sketch an estimated line of best fit, (b) decide if the association is positive or negative, then (c) decide whether the correlation is weak or strong.
Source: 2004 Statistical Abstract of the United States, Tables 2 and 641
x (1970s0) | y |
0 | 5.1 |
5 | 7.6 |
10 | 12.3 |
15 | 17.7 |
20 | 23.3 |
25 | 27.7 |
30 | 35.0 |
33 | 37.8 |
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