# Bus 308 Week 1 Assignment

Pages: 2 (560 words) Published: September 17, 2012
Wimberg Week 1 Assignment

1.2 Below we list several variables. Which of these are quantitative and which are qualitative? Explain Quantitative is a number it represents the quantity, qualitative are the variables.
a. The dollar amount on an accounts receivable invoice = quantitative
b. The net profit for a company in 2009. = quantitative
c. The stock exchange on which a company’s stock is traded. = qualitative
d. The national debt of the US in 2009. = quantitative
e. The advertising medium (radio, TV, or print used to promote a product = qualitative

1.17 Classify each of the following qualitative variables as ordinal or nominative. Explain your answers Qualitative VariableCategoriesAnswer
Statistic course letter grade A B C D E Ordinal
Door choices on “Lets make a deal”Door #1 Door #2 Nominative TV show classificationsTV-G TV-PG TV- 14 TV-MAOrdinal
Personal computer ownershipYes NoNominative
Restaurant rating***** **** *** ** *Ordinal
Income tax filing statusMarried filing jointlyNominative
Married filing separately
Single
Qualifying window(er)

3.3 Calculate the mean, median, and mode for each of the following populations of numbers; a. 9, 8, 10, 10, 12, 6, 11, 12, 8
Mean u= 9 + 8 + 10 + 10 + 12 + 6 + 11 + 12 + 8 = 86 = 9.555555555555556
9 9

Median 6 8 8 10 10 11 12 12 = (10 + 10)/2 = 10

Mode 6 8 8 10 10 11 12 12 = 10 because this is multimodal and 10 is in the center

3.22 In order to control costs, a company wishes to study the amount of money it’s sales force spends entertaining clients. a. x-bar = (157+132+109+145+125+139)/6=\$134.5

s^2 = ((157-134.5)^2+(132-134.5)^2+(109-134.5)^2+(145-134.5)^2+(125-134.5)^2+(139-134.5)^2)/5 = \$276.7 s=sqrt(s^2) = sqrt(276.7) =\$ 16.634

b. 69.26% of the expense would fall within 1 standard deviation from the mean -> 134.5+/- 16.634 = (\$117.866, \$...