Staff Another survey was done at Center Hospital to determine how long (in months) clerical staff had been in their current positions. The responses (in months) of 20 clerical staff members were

$$\begin{array}{rrrrrrrrrr}25 & 22 & 7 & 24 & 26 & 31 & 18 & 14 & 17 & 20 \\ 31 & 42 & 6 & 25 & 22 & 3 & 29 & 32 & 15 & 72\end{array}$$

Compare this plot with the one in the previous problem. Discuss the locations of the medians, the locations of the middle halves of the data banks, and the distances from $Q_1$ and $Q_3$ to the extreme values.

Driving would be more pleasant if we didn't have to put up with the bad habits of other drivers. USA Today reported the results of a Valvoline Oil Company survey of 500 drivers, in which the drivers marked their complaints about other drivers. The top complaints turned out to be tailgating, marked by 22% of the respondents; not using turn signals, marked by 19%; being cut off, marked by 16%; other drivers driving too slowly, marked by 11%; and other drivers being inconsiderate, marked by 8%. Make a Pareto chart showing percentage of drivers listing each stated complaint. Could this information as reported be put in a circle graph? Why or why not?

The National Education Association Almanac of Higher Education gives the following average distribution of professional time allocation: teaching, 51% research, 16%; professional growth, 5%; community service, 11%; service to the college, 11%; and consulting outside the college, 6%. Make a pie chart showing the allocation of professional time for college professors.

Find each term of the arithmetic series, and then verify the given sum.

Given the sample data x: 23 17 15 30 25. Find the range.

One indicator of an outlier is that an observation is more than 2.5 standard deviations from the mean. Consider the data value 80. If a data set has mean 70 and standard deviation 3, is 80 a suspect outlier?

One indicator of an outlier is that an observation is more than 2.5 standard deviations from the mean. Consider the data value 80. If a data set has mean 70 and standard deviation 5, is 80 a suspect outlier?

Where does all the water go? According to the Environmental Protection Agency (EPA), in a typical wetland environment, 38% of the water is outflow; 47% is seepage; 7% evaporates; and 8% remains as water volume in the ecosystem. Chloride compounds as residuals from residential areas are a problem for wetlands. Suppose that in a particular wetland environment the following concentrations (mg/l) of chloride compounds were found: outflow, 64.1; seepage, 75.8; remaining due to evaporation, 23.9; in the water volume, 68.2. Compute the weighted average of chlorine compound concentration (mg/l) for this ecological system.

At General Hospital, nurses are given performance evaluations to determine eligibility for merit pay raises. The supervisor rates the nurses on a scale of 1 to 10 (10 being the highest rating) for several activities: promptness, record keeping, appearance, and bedside manner with patients. Then an average is determined by giving a weight of 2 for promptness, 3 for record keeping, 1 for appearance, and 4 for bedside manner with patients. What is the average rating for a nurse with ratings of 9 for promptness, 7 for record keeping, 6 for appearance, and 10 for bedside manner?

Consider the following types of data that were obtained from a random sample of 49 credit card accounts. Identify all the average (mean, median, or mode) that can be used to summarize the data. (a) Outstanding balance on each account (b) Name of credit card (e.g., MasterCard, Visa, American Express, etc.) (c) Dollar amount due on next payment

In the Aloha state, you are very unlikely to be murdered! However, it is considerably more likely that your house might be burgled, your car might be stolen, or you might be punched in the nose. That said, Hawaii is still a great place to vacation or, if you are very lucky, to live. The following numbers represent the crime rates per 100,000 population in Hawaii: murder, 2.6; rape, 33.4; robbery, 93.3; house burglary, 911.6; motor vehicle theft, 550.7; assault, 125.3 (Source: Crime in the United States, U.S. Department of Justice, Federal Bureau of Investigation). Display this information in a Pareto chart, showing the crime rate for each category.

Alexander Borbely is a professor at the University of Zurich Medical School, where he is director of the sleep laboratory. The histogram in the given figure 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, the standard deviation of hours of sleep, and the coefficient of variation.

Consider a data set with at least three data values. Suppose the highest value is increased by 10 and the lowest is decreased by 5 .

Does the median change? Explain.

In the Aloha state, you are very unlikely to be murdered! However, it is considerably more likely that your house might be burgled, your car might be stolen, or you might be punched in the nose. That said, Hawaii is still great place for a vacation or, if you are very lucky, to live. The following numbers represent the crime rates per 100,000 population in Hawaii: murder, 2.6; rape, 33.4; robbery, 93.3; house burglary, 911.6; motor vehicle theft, 550.7; assault, 125.3. (b) Could the information as reported be displayed as a circle graph? Explain. Hint: Other forms of crime, such as arson, are not included in the information. In addition, some crimes might occur together.