10.20 Annual increase? Refer to the previous exercise. Let’s proceed with inference.

  1. (a) Do these data support a linear trend in the number of tornadoes? Justify your answer.

  2. (b) Construct a 95% confidence interval for the average annual increase in the number of tornadoes. Explain how this interval can be used to justify your response in part (a).

  3. (c) What is the predicted number of tornadoes in 2015?

  4. (d) Provide an interval that should contain the actual count 95% of the time.