A major airline company is concerned that its proportion of late arrivals has substantially increased in the past month. Historical data shows that on average 18 percent of the company airplanes have arrived late. In a random sample of 1,240 airplanes, 190 airplanes have arrived late. If we are conducting a hypothesis test to determine if the proportion of late arrivals has decreased, what is the alternative hypothesis? A) Ha: p ≥ .18 B) Ha: p > .18 C) Ha: p ≤ .18 D) Ha: p < .18

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.