Mathematics, 18.03.2022 14:00, laqu33n021
A health research institute collects information from 20 individuals on the number of years they have spent smoking cigarettes, and their age of death. The data is summarized below:
∑x=1257
∑y^2=836
∑x^2=98823
∑y=116
∑(xy)=8249
Find the correlation coefficient (r):
Answers: 3
![r = \frac{n(\sum xy) - \sum x \sum y}{\sqrt{[n \sum x^2 - (\sum x)^2][n\sum y^2 - (\sum y)^2}}](/tpl/images/2699/4946/2fe21.png)
![r = \frac{20 *8249 - 1257* 116}{\sqrt{[20 * 98823 - 1257^2][20 * 836 - 116^2}}](/tpl/images/2699/4946/f3a59.png)
![r = \frac{20 *8249 - 1257* 116}{\sqrt{[20 * 98823 - 1580049][20 * 836 - 13456}}](/tpl/images/2699/4946/d4f12.png)
![r = \frac{164980 - 145812}{\sqrt{[1976460 - 1580049][16720 - 13456}}](/tpl/images/2699/4946/ad5f2.png)
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