In question 78, a statistician argues that the length of delay may depend on the airport from which the airplane departs. Accordingly, the data were regrouped to reflect departure sites X, Y, and Z. Here are the results:

Redo the test to decide whether the airlines’ delay times are about equal by considering the effect of departure location. Use 5 %.

Question 78

A Consumer Protection Coalition decides to study the delay times, in minutes,
for four different airlines: A, B, C, and D.

It is believed that the average delay times of the 4 airlines are about equal. Do a test at the 5%level to decide whether the data support rejecting this hypothesis.

Transcribed Image Text:

Airlines A B C D X 25 22 21 30 35 31 24 28 Y 35 33 34 32 30 28 29 27 44 41 40 15 31 32 17 19