7. Compute relative comparisons between each of the different sleep groups, using the 6 to 8 hours per day group as the reference (or unexposed group). Incidence rate (per 1,000 person-years) Group Relative rate ratio < 6 hours/day 6-8 hours/day 8-9 hours/day 9-10 hours/day 10+ hours/day 7.8 Reference

The numbers of "near misses" recorded for the last 20 months at Lima International Airport are 3, 2, 3, 2, 2, 3, 5, 1, 2, 2, 4, 4, 2, 6, 3, 5, 2, 5, 1, and 3. Click here for the Excel Data File Determine the mean number of misses per month and the limits on the number of misses per month. (Leave no cells blank - be certain to enter "O" wherever required. Round your answers to 2 decimal places.) Mean number of defects per unit LCL UCL Are there any months where the number of near misses is out of control? O Yes O No MacBook Air

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The serum cholesterol levels (in 244, 235, 249, 237, 228, 220, 201, 259, 191, 198, 240, 196, 222, 252, 203, 211, 215, 254 Send data to calculator (a) mg th Find 30 and 75th percentiles for these cholesterol levels. (b) dL (If necessary, consult a list of formulas.) The 30th percentile: -) of 18 individuals are The 75th percentile: mg dL mg dL

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a. State incidence of Chlamydla (per 1,000 population) b. Case fatality rate of syphilis C. Cause-specific death rate of AIDS (per 10,000 population)

An excess of high values for the cases distributed on a graph results in a positive skew in the data?

Suppose a data set has size 10. Indicate which of the following would change if the maximum of the data set was replaced with a larger value. (a)First quartile (b)Median (c)Range (d)Mean