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Exam 2: Descriptive Statistics: Tabular and Graphical Presentations

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Question 1

Multiple Choice

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In constructing a frequency distribution, as the number of classes are decreased, the class width

A) decreases
B) remains unchanged
C) increases
D) can increase or decrease depending on the data values

E) All of the above
F) B) and C)

Correct Answer

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C

Question 2

Multiple Choice

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The difference between the lower class limits of adjacent classes provides the

A) number of classes
B) class limits
C) class midpoint
D) class width

E) A) and C)
F) None of the above

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Question 3

Multiple Choice

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Exhibit 2-2 A survey of 800 college seniors resulted in the following crosstabulation regarding their undergraduate major and whether or not they plan to go to graduate school. -Refer to Exhibit 2-2. What percentage of the students does not plan to go to graduate school?

The sum of the percent frequencies for all classes will always equal

There are 800 students in the School of Business Administration. There are four majors in the School: Accounting, Finance, Management, and Marketing. The following shows the number of students in each major. Develop a percent frequency distribution and construct a bar chart and a pie chart.

The test scores of 14 individuals on their first statistics examination are shown below. Construct a stem-and-leaf display for these data.

Exhibit 2-3 Michael's Compute-All, a national computer retailer, has kept a record of the number of laptop computers they have sold for a period of 80 days. Their sales records are shown below: Number of Laptops Sold Number of Days 0 - 19 5 20 - 39 15 40 - 59 30 60 - 79 20 80 - 99 10 Total 80 -Refer to Exhibit 2-3. The class width of the above distribution is

Exhibit 2-1 The numbers of hours worked (per week) by 400 statistics students are shown below. -Refer to Exhibit 2-1. The percentage of students working 19 hours or less is

In a cumulative relative frequency distribution, the last class will have a cumulative relative frequency equal to

Five hundred recent graduates indicated their majors as follows. a.Construct a relative frequency distribution. b.Construct a percent frequency distribution.

The SAT scores of a sample of business school students and their genders are shown below. a.How many students scored less than 20? b.How many students were female? c.Of the male students, how many scored 25 or more? d.Compute row percentages and comment on any relationship that may exist between SAT scores and gender of the individuals. e. Compute column percentages.

For the following observations, plot a scatter diagram and indicate what kind of relationship (if any) exist between x and y.

The relative frequency of a class is computed by

A sample of the ages of 10 employees of a company is shown below. Construct a dot plot for the above data.

Construct a stem-and-leaf display for the following data.

Exhibit 2-1 The numbers of hours worked (per week) by 400 statistics students are shown below. -Refer to Exhibit 2-1. The midpoint of the last class is

Exhibit 2-1 The numbers of hours worked (per week) by 400 statistics students are shown below. -Refer to Exhibit 2-1. The cumulative percent frequency for the class of 30 - 39 is

A cumulative relative frequency distribution shows

A frequency distribution is a tabular summary of data showing the

A student has completed 20 courses in the School of Arts and Sciences. Her grades in the 20 courses are shown below. a.Develop a frequency distribution and a bar chart for her grades. b.Develop a relative frequency distribution for her grades and construct a pie chart.