The Correlation. Correlation is a measue of how close the line fits the points that you found in your experiment. Anyone can say whether they think the line is a good fit or not, but to measure it exactly, we use the correlation coefficient: R2.
As the seasons change and the amount of sunlight decreases, less chlorophyll is produced, and the leaves appear less green. Chlorophyll is broken down into simpler compounds at a constant rate, so green leaf color will gradually fade as chlorophyll production slows or stops.
The color we see when we look at leaves comes from cells called pigments. The green color we see every spring comes from the pigment called chlorophyll. Throughout the summer the pigments that give us fall colors such as orange, yellow, and brown are produced in the leaves, but they are hidden by the green chlorophyll.