Objective

Objective: Calculate the mean, median, and mode for grouped and ungrouped data sets. (ungrouped data) The unemployment rate in the state of Alaska for the 12 months of 2002 is given in the table below: Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 8.6 8.8 8.4 7.8 7.2 7.4 6.9 6.8 7.1 7.5 7.9 8.6 a. What is the arithmetic mean of the Alaskan unemployment rates? b. Find the median and the mode for the unemployment rates. c. Compute the arithmetic mean and median for just the winter (Dec–Mar) months. Is it much different? 2) (ungrouped data) Big Orange Trucking is designing an information system for use on “in-cab” communications. It must summarize data from eight sites throughout a region to describe typical conditions. Compute an appropriate measure of central location for each of the three variables shown in the table below: City Wind Direction Temperature Pavement Anniston, AL West 89 Dry Atlanta, GA Northwest 86 Wet Augusta, GA Southwest 92 Wet Birmingham, AL South 91 Dry Jackson, MS Southwest 92 Dry Meridian, MS South 92 Trace Monroe, LA Southwest 93 Wet Tuscaloosa, AL Southwest 93 Trace 3) (grouped data) Health issues are a concern of managers, especially as they evaluate the cost of medical insurance. A recent survey of 150 executives at Elvers Industries, a large insurance and financial firm located in the Southwest, reported the number of pounds by which the executives were overweight. Compute the mean and the standard deviation. Pounds Overweight Frequency 0 up to 6 14 6 up to 12 42 12 up to 18 58 18 up to 24 28 24 up to 30 8

Objective: Differentiate among the various levels of measurement. 1. What is the difference between discrete and continuous variables? Under what circumstances would each be applicable? 2. The Acme School of Locksmithing has been accredited for the past 15 years. Discuss how this information might be interpreted as a a. qualitative variable. b. quantitative variable.

1.9 Jeff Bowlen, a labor relations expert, has collected information on strikes in various industries.