Quote:
Originally posted by Golden Teapot
On, come along this is easy.
Think about a paint manufacturing machine that produces on average 5000 tins of paint per day. Pull the power plug out and tell me how many sample points you'd need to decide that electricity has an impact on paint output.
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Maybe I could have worded my post better. In your example, power obviously has a major effect if it is taken away, but with power, there would be many other factors that influence the factory's output. If you wanted to find out what influence a specific factor has, you would control for whether the plant had power or not.
So we'll assume weather does have an influence, but controller for other factors we could find out to what degree that influence is.
Or maybe I just missed your point completely.