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Compute a confidence interval for the population mean

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Please show computations if applicable.

1. Compute a 95% confidence interval for the population mean, based on the sample numbers 21, 28, 33, 34, 25, 26, and 135. Find the lower and upper limits of the interval.

2. Change the last value to 27 and re-compute the confidence interval. The numbers now are: 21, 28, 33, 34, 25, 26, and 27.

3. What is an outlier and how does it affect the confidence interval? And what does it do to the standard deviation?

4. The director of admissions is concerned about the high cost of textbooks for the students each semester. A sample of 25 students enrolled in the university indicates that x(bar) =$315.40 and s = $43.20. Using a significance level of .1, what are the boundaries of the confidence interval?

Reference no: EM132857761

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