For Exercises 23–35, do the following:

  1. Provide the null and alternative hypotheses.
  2. Describe the two ways a correct decision could be made in the context of the problem.
  3. Describe what a Type I error would mean in the context of the problem.
  4. Describe what a Type II error would mean in the context of the problem.

Question 9.26

26. Traffic Light Cameras. The Ministry of Transportation in the province of Ontario wants to determine whether the installation of cameras that take pictures at traffic lights has decreased the mean number of fatal and injury collisions to below the previous mean of 339.1 per year.