Question 6.44

9. The following table shows excerpted and rounded data collected on crickets by Harvard physics professor George W. Pierce in his 1948 book The Song of Insects:

Chirps per 15 seconds 44 37 31 25 15
Ground temperature (in °F) 80 68 73 63 55
  1. Which is the explanatory variable?
  2. Make a scatterplot. Is the association between these variables positive or negative?
  3. Describe the form and strength of the relationship.
  4. Do the data seem consistent with a rule of thumb from The Old Farmer’s Almanac to count the number of chirps in 14 seconds and then add 40 to get the (Fahrenheit) temperature?

9.

(a) Ground temperature

(b) Positive association

image

(c) Strong, straight-line pattern

(d) Yes