Question 2.60

2.60 A product for lab experiments

In Exercise 2.17 (page 73), you described the relationship between time and count for an experiment examining the decay of barium. In Exercise 2.29 (page 78), you found the correlation between these two variables.

  1. Find the least-squares regression equation for predicting count from time.
  2. Use the equation to predict the count at one, three, five, and seven minutes.
  3. Find the residuals for one, three, five, and seven minutes.
  4. Plot the residuals versus time.
  5. What does this plot tell you about the model you used to describe this relationship?