The average temperature in the North Pole in the summer is 32 degrees F. The average temperature in the North Pole in the winter is -40 degrees F. Kevin says that the difference between these two temperatures is 8 degrees.

Identify the error in Kevin's thinking. Determine the difference between these two temperatures, and explain or show your process.

(b) suppose that consolidated power decides to use a level of significance of α = .05, and suppose a random sample of 100 temperature readings is obtained. if the sample mean of the 100 temperature readings is x⎯⎯ = 60.990, test h0 versus ha and determine whether the power plant should be shut down and the cooling system repaired. perform the hypothesis test by using a critical value and a p-value. assume σ = 5. (round your z to 2 decimal places and p-value to 4 decimal places.)