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.
We hypothesized that if green leaves have a significantly higher rate of photosynthesis (consumption of CO 2) than yellow leaves, because green leaves contain more green chlorophyll a and chlorophyll b photosynthetic pigments than yellow leaves, then the color of the leaves affects the rate of photosynthesis.