Have you ever wondered why the chirping of crickets sounds so loud on a summer night? Why is the chirping sometimes faster of slower? The sounds are made by the male cricket rubbing its wings together to serenade the female crickets. There is an interesting relationship between the frequency of the chirps and the temperature. Below is the data collected by Dr. Peggy LeMone. Use the sliders to determine a best fit line for the data.

What is your equation of a best fit line?
What is the equation of the best fit line?
In 1897 Amos Dolbear published an article called "The Cricket as a Thermometer." In wrote that the temperature is equal to the number of chirps per minute minus 40 divided by four and add 50. How does the equation of the best fit line compare to Dolbear's equation?
What are some reasons why the equations are different?