In testing a proportion, which of the following statements is incorrect? multiple choice when the sample proportion is p = .02 and n = 150, it is safe to assume normality. an 80 percent confidence interval is narrower than the 90 percent confidence interval, ceteris paribus. the sample proportion may be assumed approximately normal if the sample is large enough. using α = .05 rather than α = .01 would make it more likely that h0 will be rejected.