Assignmet_1_suggested_solutions.doc

Speaking of Statistics(12) - Assignment 1 – Suggested Solution Below we list several variables. Which of these variables are quantitative and which are qualitative? Explain. a. The dollar amount on an accounts receivable invoice. ? Quantitative b. The net profit for a company in 2005. ? Quantitative c. The stock exchange on which a company’s stock is traded. ? Qualitative d. The national debt of the United States in 2005. ? Quantitative e. The advertising medium (radio, television, or print) used to promote a product. ? Qualitative Classify each of the following qualitative variables as ordinal or nominative. Explain your answers. Qualitative Variables The Corresponding Categories Statistics course letter grade A B C D F ?Ordinal Personal computer ownership Yes No ? Nominal Restaurant rating ***** **** *** ** * ? Ordinal Incoming tax filing status Married filing jointly; Married filing separately; Single; Head of household; Qualifying widow(er) ? Nominal Forbes magazine publishes the Forbes Platinum 400 –a list of the “Best Big Companies in America” as selected by the magazine’s writers and editors. Table above gives the best companies in the retailing industry as given in this list on the Forbes website on March 16, 2005. (Data in the last page). Organize data of the profit margin percentages into a frequency distribution. Number of class K=6 (Since where n is the total number of data = 35.) The class length is calculated as Class Frequency Relative Frequency Percentage Frequency 1.1-4.9 14 0.40 40.0% 5.0-8.8 17 0.49 48.6% 8.9-12.7 3 0.09 8.6% 12.8-16.6 0 0.00 0.0% 16.7-20.5 0 0.00 0.0% 20.6-24.4 1 0.03 2.9% Construct a stem-and leaf display of the return on capital percentages for the retailers in Table. Find the median and then descr