Listed below are actual temperatures (°F) along with the temperatures that were forecast five days earlier (data collected by the author). Use a 0.05 significance level to test the claim that differences between actual temperatures and temperatures forecast five days earlier are from a population with a mean of 0°F.

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Actual Temperature (°F) Temperature (°F) Forecast Five Days Earlier 80 77 80 80 79 80 81 85 73 73 80 72 83 81 76 73 77 83 73 79 82