Bus 308 Week 1 Assignment

Topics: Standard deviation, Arithmetic mean, Mean 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
Head of household
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, $...
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