Jill just made a purchase online. The store that she bought from gave her the option to pay with a check, money order, or credit card. Item will not be shipped until her payment arrives. Why would you want to use a credit card instead of a money order or check? Explain.

(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.)