Exam 2: Descriptive Statistics: Tabular and Graphical Presentations

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

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.

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

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

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

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?

A cumulative relative frequency distribution shows

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.

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

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

The relative frequency of a class is computed by

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

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

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

A frequency distribution is a tabular summary of data showing the

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

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

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

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.

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