9 a survey of enrollment at 15 community colleges across the...

9. A survey of enrollment at 15 community colleges across the United States yielded the following figures: 16414 15550 2109 9350 21828 5722 2825 21044 5481 5200 10012 6357 27000 9414 7681 a) Use the built-in features of your technology to calculate the mean and the sample standard deviation. b) A school with an enrollment of 8000 would be how many standard deviations away from the mean (i.e., find the z-score)?

A random survey of enrollment at 35 community colleges across the United States yielded the following figures: 6,412; 1,550; 2,107; 9,349; 21,829; 4,302; 5,942; 5,722; 2,824; 2,046; 5,479; 5,202; 5,855; 2,748; 10,010; 6,359; 27,000; 9,415; 7,680; 3,201; 17,498; 9,200; 7,381; 18,312; 6,559; 13,712; 17,768; 7,491; 2,771; 2,863; 1,265; 7,285; 28,167; 5,080; 11,622. Assume the underlying population is normal. A. Find the following. (Round your answers to the nearest whole number.) (i) x = (ii) sx = (iii) n = (iv) n - 1 = B. Which distribution should you use for this problem? (Enter your answer in the form z or tdf where df is the degrees of freedom.) Construct a 95% confidence interval for the population mean enrollment at community colleges in the United States. (i) State the confidence interval. (Round your answers to two decimal places.) ( , ) (ii) Sketch the graph. (Round your answers to two decimal places. Enter your α/2 to three decimal places.) find the error bound

Rashmi S.

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