Hypothesis = The mean number of clients entering rehab will increase
as the temperature of the weather decreases.



Please compute covariance for the following data.  Please show
computation formula.

Years 2001, 1999, 1998, 1997, 1996

Number of clients entering rehab when weather temperature was: 50, 55,
60 degrees =: 2001: 900, 1999: 800, 1998: 850, 1997: 900, 1996: 900

For the same years when weather was 70 80 85 clients entering rehab
were: 700, 750, 700, 650, 750

For same years when weather was 90 100 100+ clients entering rehab
were: 600, 700, 700, 600, 650

For same years when weather was 75 80 90 clients entering rehab were:
600, 700, 700, 650, 650

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Clarification of Question by boobee-ga on 28 Sep 2002 19:47 PDT

The number of clients that enter rehab in the winter months are
greater than the number of clients that enter rehab any other time of
the year.

I only guessed that this problem should be computed using covariance. 
If this is incorrect, please compute using the correct statistical
test.