The author recorded actual temperatures along with temperatures that were predicted 5 days earlier. Results are listed below. Construct a 99% confidence interval of the mean of the population of "actual/forecast" differences. What does the result suggest about the forecast?
Actual: 80, 73, 78, 73, 82, 81, 74, 62
Forecast: 80, 79, 79, 78, 73, 79, 70, 69