A major airline company is concerned that its proportion of late arrivals has substantially increased in...
A major airline company is concerned that its proportion of late arrivals has substantially increased in the past month. Historical data shows that on the average 18% of the company airplanes have arrived late. In a random sample of 1,240 airplanes, 310 airplanes have arrived late. If we are conducting a hypothesis test of a single proportion to determine if the proportion of late arrivals has increased: What is the value of the calculated test statistic?
Homework Answers
Sample proportion 
= 310 /
1240 = 0.25
Test statistics
z = - p / sqrt(
p (1 - p ) / n)
= 0.25 - 0.18 / sqrt( 0.18 * 0.82 / 1240)
= 6.42
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