Question

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  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  business travelers follow.

8	8	4	0	5	5	5	4	4	4	4	3	10
6	10	10	0	8	5	4	3	2	4	7	8	9
10	8	4	5	5	4	4	3	8	9	9	5	3
9	8	8	5	10	4	10	5	5	3	3

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

Answer 1

* *as nothing is mentioned i am using 95 % confidence interval estimate of the population mean rating for Miami,

the necessary calculation table:-

x	x2
8	64
6	36
10	100
9	81
8	64
10	100
8	64
8	64
4	16
10	100
4	16
8	64
0	0
0	0
5	25
5	25
5	25
8	64
5	25
10	100
5	25
5	25
4	16
4	16
5	25
4	16
4	16
10	100
4	16
3	9
3	9
5	25
4	16
2	4
8	64
5	25
4	16
4	16
9	81
3	9
4	16
7	49
9	81
3	9
3	9
8	64
5	25
10	100
9	81
3	9
sum=287	sum=2005

sample size(n) = 50

degrees of freedom = (n-1)= (50-1) = 49

t critical value for 95% confidence level, df=49,both tailed test be:-

[ from t distribution table]

the 95% confidence interval  estimate of the population mean rating for Miami be:-

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