Question

Question 8

The common cricket can be used as a crude thermometer. The colder the temperature, the slower the rate of chirping. The table below shows the average chirp rate of a cricket at various temperatures.

Chirp Rate (chirps/second) Temperature

(ºF)

2.5 52.2

2.9 61.4

4 74.5

2.2 53.3

3.7 70.9

2.6 61.7

Compute the least-squares regression line for predicting the temperature from the chirp rate.

Question 8 options:

a) y = 12.3889 + 26.2719x

b) y = 12.0876 + 26.2719x

c) y = 26.2719 + 12.0876x

d) y = 26.2719 + 12.3889x

Question 9

An automotive engineer computed a least-squares regression line for predicting the gas mileage (y) in miles per gallon of a certain vehicle from its speed (x) in miles per hour. The result is y = -0.15x + 36.14.

Predict the gas mileage when the vehicle is travelling at 60 miles per hour. Round your answer to one decimal place. Only write a number as your answer.

Answer 1