Golf course designer roberto langabeer is evaluating two sites, palmetto dunes and ocean greens, for his next golf course. he wants to prove that palmetto dunes residents (population 1) play golf more often than ocean greens residents (population 2). roberto commissions a market survey to test this hypothesis. the market researcher used a random sample of 64 individuals from each suburb, and reported the following: ch10_q27 1 = 15 times per month and ch10_q27 2 = 14 times per month. assume that σ 1 = 2 and σ 2 = 3. with α = .01, the critical z value is