Customer-to-customer business model. Customer to customer (C2C) is a business model that enables customers to trade with one another usually in an online environment. A data set has been built to explore the user behavior of a successful website in order to understand the benchmarks pertaining to online sales and clients. The top 30 countries with the most daily buyers are stored in the C2C file and the top five countries are listed in the accompanying table. Descriptive statistics for these variables are shown in the second table. PROPERTIES C2C M02_MCCL3396_14_GE_C02.indd 137 29/09/2021 13:39 138 CHAPTER 2 ● Methods for Describing Sets of Data Request Number Marketing Engineering Accounting Lost? 1 7.0 6.2 .1 No 2 .4 5.2 .1 No 3 2.4 4.6 .6 No 4 6.2 13.0 .8 Yes 5 4.7 .9 .5 No f f f f f 46 6.4 1.3 6.2 No 47 4.0 2.4 13.5 Yes 48 10.0 5.3 .1 No 49 8.0 14.4 1.9 Yes 50 7.0 10.0 2.0 No

a. Construct a stem-and-leaf display for the total processing time for each department. Shade the leaves that correspond to “lost” orders in each of the displays, and interpret each of the displays.

b. Using your results from part

a, develop “maximum processing time” guidelines for each department that, if followed, will help the firm reduce the number of lost orders.

c. Generate summary statistics for the processing times. Interpret the results.

d. Calculate the z-score corresponding to the maximum processing time guideline you developed in part b for each department, and for the total processing time.

e. Calculate the maximum processing time corresponding to a z-score of 3 for each of the departments. What percentage of the orders exceed these guidelines? How does this agree with Chebyshev’s Rule and the Empirical Rule?

f. Repeat part e using a z-score of 2. g. Compare the percentage of “lost” quotes with corresponding times that exceed at least one of the guidelines in part e to the same percentage using the guidelines in part

f. Which set of guidelines would you recommend be adopted? Why?