An outbreak of the deadly ebola virus in 2002 and 2003, Ask an Expert

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An outbreak of the deadly Ebola virus in 2002 and 2003 killed 91 of the 95 gorillas in 7 home ranges in the Congo. To study the spread of the virus, measure distance by the number of home ranges separating a group of gorillas from the first group infected. Here are data on distance and number of days until deaths began in each later group:

Distance x	1	4	6	6	6	7
Days y	2	20	29	38	44	50

Find the correlation r between x and y.

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