Temperature affects the rate at which a cricket chirps; the higher the temperture, the faster the rate. A South African researcher collected data (chirp rate in chirps per second and air temperature in degrees Celsius) for some African crickets. The results, shown in the following scatterplot, have a correlation of 0.618. 

a. Describe the direction, form, and strength of the association between temperature and chirps per second. 

b. There were two different species of crickets represented in the data. In the following scatterplot, the blue dots represent the Karschi species and the orange dots represent the Fultoni species. Remember that the correlation for both species together was 0.618. Does this number change much if we just focus on the Karschi? Just focus on the Fultoni? Explain.

Transcribed Image Text:

Chirps/sec 2.5 2.0 1.5 1.0 0.5 10 15 20 Temperature (°C) - 25