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ECOn 2300 Ch2
Subject: Economics    / General Economics
Question

Econ2300
assignment: Ch2 Quiz

Exercise 2.8 METHODS AND APPLICATIONS
Fifty randomly selected adults who follow professional sports were asked to name their favorite professional sports league. The results are as follows where MLB = Major League Baseball, MLS = Major League Soccer, NBA = National Basketball Association, NFL = National Football League, and NHL = National Hockey League.

NFL NBA NFL MLB MLB NHL NFL NFL MLS MLB
MLB NFL MLB NBA NBA NFL NFL NFL NHL NBA
NBA NFL NHL NFL MLS NFL MLB NFL MLB NFL
NHL MLB NHL NFL NFL NFL MLB NFL NBA NFL
MLS NFL MLB NBA NFL NFL MLB NBA NFL NFL
________________________________________

1.
award:
10 out of
10.00 points

Exercise 2.8 METHODS AND APPLICATIONS Part a
(a) Find the frequency distribution, relative frequency distribution, and percent frequency distribution for these data. (Round your Relative Frequency answers to 2 decimal places.)

Sports League Frequency Relative
Frequency Percent
Frequency
MLB 11 0.22 22
MLS 3 0.06 6
NBA 8 0.16 16
NFL 23 0.46 46
NHL 5 0.10 10
________________________________________
Total 50
________________________________________
________________________________________

2.

Exercise 2.8 METHODS AND APPLICATIONS Part b
(b) Choose the frequency bar chart for these data.

3.

Exercise 2.8 METHODS AND APPLICATIONS Part c
(c) Choose the pie chart for these data.

Multiple Choice Difficulty: Medium
Exercise 2.8 METHODS AND APPLICATIONS Part c Learning Objective: 02-01 Summarize qualitative data by using frequency distributions, bar charts, and pie charts.

4.

Exercise 2.8 METHODS AND APPLICATIONS Part d
(d) Which professional sports league is most popular with these 50 adults? Which is least popular?

Most popular league is NFL and least popular is MLS .

Exercise 2.25 THE CASE
Forbes magazine publishes a list of “The 400 Best Big Companies” as selected by the magazine’s writers and editors. Table 2.13 gives the best companies in the retailing industry as given by this list on the Forbes.com website on February 27, 2007.
5.

Exercise 2.25 THE CASE Part b-1
(b-1) Choose the percent frequency histogram for the sales values.

6.

Exercise 2.25 THE CASE Part b-2
(b-2) What is the distribution shape?

Skewed left

Skewed right

Symmetric
A manufacturer produces a bulk chemical product. Customer requirements state that this product must have a specified viscosity when melted at a temperature of 300°F (viscosity measures how thick and gooey the product is when melted). Chemical XB-135 is used in the production of this chemical product, and the company’s chemists feel that the amount of chemical XB-135 may be related to viscosity. In order to verify and quantify this relationship, 24 batches of the product are produced. The amount (x) of chemical XB-135 (in pounds) is varied from batch to batch and the viscosity (y) obtained for each batch is measured. Table 2.23 gives (in time order) the values of x and the corresponding values of y obtained for the 24 batches.
7.

(a) Choose the scatter plot of viscosity (y) versus the amount (x) of chemical XB-135.

8.

(b) Choose the kind of relationship between y and x.

Strong positive linear relationship

There is no relationship

Strong negative relationship
The data produces a scatter plot with data forming in an upward slanting line to the right.
Such a plot indicates a strong positive relationship.

9.

MC Qu. 12 ________ can be used to study the relationsh…
________ can be used to study the relationship between two variables.

Cumulative frequency distributions

Dot plots
?
Crosstabulation tables

Frequency tables
12.

MC Qu. 20 A ______________ displays the frequency of e…
A ______________ displays the frequency of each group with qualitative data and a _____________ displays the frequency of each group with quantitative data.

scatter plot, bar chart

stem and leaf, pie chart

histogram, stem and leaf display

bar chart, histogram
17.

MC Qu. 26 Which of the following graphical tools is no…
Which of the following graphical tools is not used to study the shapes of distributions?

Dot plot
?
Scatter plot

Stem-and-Leaf display

Histogram
19.

MC Qu. 41 A company collected the ages from a random s…
A company collected the ages from a random sample of its middle managers with the resulting frequency distribution shown below:

What is the relative frequency for the largest interval?

.132

.231

.226
?
.283

.288
20.

MC Qu. 42 A company collected the ages from a random s…
A company collected the ages from a random sample of its middle managers with the resulting frequency distribution shown below:

What is the midpoint of the third class interval?

37.5

27.5

22.5

32.5

42.5
25.

MC Qu. 63 Consider the following data on distances tra…
Consider the following data on distances traveled by people to visit the local amusement park and calculate the relative frequency for the distances over 24 miles.

.125

.375

.325

.025
?
.150
35.

MC Qu. 40 A company collected the ages from a random s…
A company collected the ages from a random sample of its middle managers with the resulting frequency distribution shown below:

What would be the approximate shape of the relative frequency histogram?

Skewed to the right

Multiple peak

Skewed to the left

Uniform

Symmetrical
40.

MC Qu. 55 A histogram that tails out towards smaller v…
A histogram that tails out towards smaller values is _____.

a scatterplot

skewed to the right
?
skewed to the left

normal
41.

MC Qu. 58 A(n) ________ is a graph of cumulative distribu…
A(n) ________ is a graph of cumulative distribution.

ogive plot

bar chart

frequency histogram

relative frequency histogram
42.

MC Qu. 72 The number of weekly sales calls by a sample…
The number of weekly sales calls by a sample of 25 pharmaceutical salespersons is below:
24, 56, 43, 35, 37, 27, 29, 44, 34, 28, 33, 28, 46, 31, 38, 41, 48, 38, 27, 29, 37, 33, 31, 40, 50
How many classes should be used in the construction of a histogram?

10

2

4

6
?
5

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