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.
excel or minitab users: the data set is available in the file named "miami." all data sets can be found in your ebook or on your student cd.
6 4 6 8 7 7 6 3 3 8 10 4 8
7 8 7 5 9 5 8 4 3 8 5 5 4
4 4 8 4 5 6 2 5 9 9 8 4 8
9 9 5 9 7 8 3 10 8 9 6
develop a 95% confidence interval estimate of the population mean rating for miami (to 2 decimals).
95% confidence:
( , )

A confidence interval is a decision criteria used in statistics. There are three decision criteria, the traditional method, the p-value method and the confidence interval. These method are use to decide if the null hypothesis is accepted or rejected.

Using a confidence interval method, we reject the hypothesis if the population parameter has a value outside this interval.

To find the confidence level we have to use this formula: ; where u is the sample mean, o is the standard deviation and n is the sample size.

So, first we have to calculate the mean and standard deviation:

.

Using a 95% of confidence level, the z-value is 1.6.

Now, we can find the confidence interval because we already have all needed values.

Hence, the confidence interval is (6.83;5.85)

the y will be in still but your answer will be y x 3

step-by-step explanation:

jk: )

x = 23.78

step-by-step explanation: