Which is an example of the associative property?
a. –(18 + 3) = –18 + (–3)
b. –17 + 0 = –17
c. (–8 + 10) + 4. = –8 + (10 + 4)
d. –5 + 7 = 7 + (–5)

(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.)