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.
Seasonal Changes. The majority of tree growth occurs in late spring and early summer. During most of the growing season, trees (plants) produce a material called chlorophyll. Chlorophyll enables plants to convert water and carbon dioxide in the presence of sunlight into carbohydrates, which plants use for food. This process is known as photosynthesis. Chlorophyll is what gives plants their green color.