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In: Statistics and Probability

An air transport association surveys business travelers to develop quality ratings for transatlantic gateway airports. The...

An 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 a certain airport. The ratings obtained from the sample of 50 business travelers follow.

6 4 6 8 7 6 6 3 3 7 10 4 8 7 8 7 5 9 4 8 4 3 8 5 4 4 4 4 8 3 5 7 2 5 9 9 8 4 8 9 9 4 9 7 8 3 10 7 9 6

Develop a 95% confidence interval estimate of the population mean rating for this airport. (Round your answers to two decimal places.)

Solutions

Expert Solution

Solution Given that Mean :00 from the given data - (1) Sample mean = 6.22 (4) Standard deviation , -:2:1935 (w) :: standard Error ila - standard errora D.3097 Buy Df inni = 50-1 ) Df:49 (o) for upper limit and lower limit values- for 24- Given 95.7. confidence Tutewal 2:1-0.95 x=0.05 = 42 -0.0250 from the Z-value tabe 251.96 3) a I 742 l m .) 6.22 1.96 (0.3097) =) (6.8270 , 5.6130) Hence, the 95% confidence Intewal is = 5.61 to 6.82 -


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