You work in a department with 17 other persons (18 persons total). If each of yo

Question

You work in a department with 17 other persons (18 persons total). If each of you just received a 4% cost-of-living pay raise, what has happened to (please provide specific/precise responses to the Parts below: for example, if a summary statistic changes, note the direction and by how much as a %) a. the mean salary for the department? b. the standard deviation of salaries for the department? c. the range of salaries for the department? d. the coefficient of variation of salaries for the department? In the last ten years, many retailers have installed self-checkout stations for customers. The table below shows self-checkout times, in seconds, for a random sample of 25 shoppers at a College Park-area Shoppers Food Warehouse grocery store: The [sample] mean equals 126.8 seconds and the [sample] standard deviation equals 99.748 seconds. a. Interpret (briefly) the value for the standard deviation. b. What percent of self-checkout times in the sample are within (plusminus) two standard deviations of the mean? c. Construct the associated five-number summary to represent all 25 self-checkout times. d. Which, if any, of the 25 self-checkout times are outlying/extreme values?

Explanation / Answer

Q 5) a) the mean salary for the department is increased by 4%

b) The standard deviation of the salaries for the department remains unchnaged

c) The range of the salaries for the department remails unchanged

d) The CV of salaries for the department is decreased by 4%

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