Use the following information for questions:
An airport official wants to prove that the p 1 = proportion of delayed flights after a storm for Airline A is less than p 2 = the proportion of delayed flights for Airline B. Random samples from two airlines after a storm showed that 51 out of 200 of Airline A's flights were delayed, and 60 out of 200 of Airline B's flights were delayed.
-Report your conclusion in terms of the two airlines.
A) The proportion of delayed flights for Airline A seems to be less than the proportion of delayed flights for Airline B.
B) The results are not statistically significant: there is not enough evidence to conclude that the proportion of delayed flights for Airline A is less than the proportion for Airline B.
C) The difference in proportions of delayed flights is at least 4%.
D) The proportion of delayed flights after a storm for Airline A seems to be greater than the proportion of delayed flights after a storm for Airline B.

Question

Use the following information for questions:
 An airport official wants to prove that the p 1 = proportion of delayed flights after a storm for Airline A is less than p 2 = the proportion of delayed flights for Airline B. Random samples from two airlines after a storm showed that 51 out of 200 of Airline A's flights were delayed, and 60 out of 200 of Airline B's flights were delayed.
-Report your conclusion in terms of the two airlines.
A) The proportion of delayed flights for Airline A seems to be less than the proportion of delayed flights for Airline B.
B) The results are not statistically significant: there is not enough evidence to conclude that the proportion of delayed flights for Airline A is less than the proportion for Airline B.
C) The difference in proportions of delayed flights is at least 4%.
D) The proportion of delayed flights after a storm for Airline A seems to be greater than the proportion of delayed flights after a storm for Airline B.

Quizplus · Accepted Answer

The difference in proportions is small (25.5% for Airline A and 30% for Airline B), and without a statistical test, we cannot conclude that the difference is significant.

Use the Following Information for Questions