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Question 523:

Use the given degree of confidence and sample data to construct a confidence interval for the population mean x. Assume that the population has a normal distribution.

The principal randomly selected six students to take an aptitude test. Their scores were:
77.9 89.1 80.7 78.6 74.4 82.0
Determine a 90 percent confidence interval for the mean score for all students.
76.36 < x < 84.54
84.64 < x < 76.26
76.26 < x < 84.64
84.54 < x < 76.36

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