14. -/1 points BBUnderStat12 3.2.021.MI. 0/6 Submissions Used My Notes In some r

Question

14. -/1 points BBUnderStat12 3.2.021.MI. 0/6 Submissions Used My Notes In some reports, the mean and coefficient of variation are given. For instance, one report gives the average number of physician visits by males per year. The average reported is 3.2, and the reported coefficient of variation is 1.9%. Use this information to determine the standard deviation of the annual number of visits to physicians made by males. (Round your answer to three decimal places.) Need Help?RaWateh Master It 15. -13 points BBUnderStat12 3.2.024. 0/6 Submissions Used My Notes Alexander Borbely is a professor at the University of Zurich Medical School, where he is director of the sleep laboratory. The histogram in the figure below is based on information from his book Secrets of Sleep. The histogram displays hours of sleep per day for a random sample of 200 subjects. Estimate the mean hours of sleep, standard deviation of hours of sleep and coefficient of variation. (Enter x to 1 decimal place, s and CV to 2 decimal places.) 70 64 50 40 30 20 10 3.5 4.5 5.5 6.5 7.5 85 9.5 10.5 Hours of sleep CV Need Help?Read It

Explanation / Answer

#14.
CV = sd/mean
1.9/100 = sd/3.2
sd = 1.9*3.2/100
sd = 0.061

#15.

xbar = 7.9

s = 1.05

CV = 1.05/7.9 * 100 = 13.31%

Days (f) Midpoint(x) x*f x^2 f*x^2 2 3.5 7 12.25 24.5 2 4.5 9 20.25 40.5 4 5.5 22 30.25 121 22 6.5 143 42.25 929.5 64 7.5 480 56.25 3600 90 8.5 765 72.25 6502.5 14 9.5 133 90.25 1263.5 2 10.5 21 110.25 220.5 200 1580 12702

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