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The International Air Transport Association surveys business travelers to develop quality ratings for transatlantic gateway airports....

The International Air Transport Association surveys business travelers to develop quality ratings for transatlantic gateway airports. The maximum possible rating is 10. Suppose a simple random sample of 50 business travelers is selected and each traveler is asked to provide a rating for the Miami International Airport. The ratings obtained from the sample of 50 business travelers follow.

1 5 6 7 8 8 8 9 9 9 9 10 3

4 5 5 7 6 8 9 10 5 4 6 5 7

3 1 9 8 8 9 9 10 7 6 4 8 10

2 5 1 8 6 9 6 8 8 10 10

Develop a confidence interval estimate of the population mean rating for Miami. Round your answers to two decimal places.

Homework Answers

Answer #1

for above data:

from excel function average(array): mean =6.76

from function stdev(array) =2.552

sample mean 'x̄= 6.760
sample size   n= 50.00
sample std deviation s= 2.552
std error 'sx=s/√n=2.552/√50 = 0.3609
for 95% CI; and 49 df, value of t= 2.010
margin of error E=t*std error    = 0.725
lower bound=sample mean-E = 6.035
Upper bound=sample mean+E = 7.485
from above 95% confidence interval for population mean =(6.03,7.49)
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