OT 6 Attempt 5
The toco toucan, the largest member of the toucan family, possesses the largest beak relative to body size of all birds. This
exaggerated feature has received various interpretations, such as being a refined adaptation for feeding. However, the large
surface area may also be an important mechanism for radiating heat (and hence cooling the bird) as outdoor temperature
increases. Here are data for beak heat loss, as a percent of total body heat loss from all sources, at various temperatures in
degrees Celsius. [Note: The numerical values in this problem have been modified for testing purposes.]
15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Temperature (°C)
Percent heat loss from beak
35|35|32 34 34 43 52 51 45 55 45 49 56 61 62 63
The equation of the least-squares regression line for predicting beak heat loss, as a percent of total body heat loss from all
sources, from temperature is: (Use decimal notation. Enter the values of the intercept and slope rounded to two decimal
places. Use the letter x to represent the value of the temperature.)
ŷ =
Use the equation of the least-squares regression line to predict beak heat loss, as a percent of total body heat loss from all
sources, at a temperature of 25 degrees Celsius. Enter your answer rounded to two decimal places.
%
beak heat as a percent of total body heat loss =
Question Source: Moore, The Basic Practice of Statistics, de
Publisher: WH Freeman