Exam 2: Graphical and Tabular Descriptive Techniques

Electronics Company At a meeting of regional offices managers of a national electronics company, a survey was taken to determine the number of employees the regional managers supervise in the operation of their departments. The results of the survey are shown below. {Electronics Company Narrative} What proportion of managers supervise 3 employees?

{Teachers Ages Narrative} Draw a frequency histogram of this data which contains six classes. What is the shape of the histogram?

Suppose you measure the number of minutes it takes an employee to complete a task, where the maximum allowed time is 5 minutes, and each time is rounded to the nearest minute. Data from 130 employees is summarized below. Construct a frequency bar chart and a pie chart from this data. How long did it take most employees to complete the task?

Which of the following statements is false?

Observations that are measured at the same time are called ____________________ data.

For each of the following, indicate whether the variable of interest is nominal or interval. a. Your marital status. b. Whether you are a U.S. citizen. c. Sally's travel time from her dorm to the student union on campus. d. The amount of time you spent last week on your homework. e. The number of cars parked in a certain parking lot at any given time. f. Kate's favorite brand of sneakers.

Which of the following statements about pie charts is false?

A modal class in a histogram is the class that includes

A(n)____________________ is a graphical display consisting of a set of points, each point representing one variable measured along the horizontal axis, and another variable measured along the vertical axis.

Suppose you measure the number of minutes it takes an employee to complete a task, where the maximum allowed time is 5 minutes, and each time is rounded to the nearest minute. Data from 130 employees is summarized below. How long did it take most employees to complete the task?

Internet Classes A survey of 25 students was conducted to determine how they rate the quality of Internet classes. Students were asked to rate the overall quality from 0 (no quality at all)to 100 (extremely good quality). The stem-and-leaf display of the data is shown below. {Internet Classes Narrative} What percentage of the students rated the overall quality of Internet classes as being 60 or below?

A stem-and-leaf display reveals more information about the original data than does a histogram.

Car buyers were asked to indicate the car dealer they believed offered the best overall service. The four choices were Convoy Motors (C), Mako Chrysler (M), Torrent Auto (T), and Unequaled Chevrolet (U). The following data were obtained: What percentage of car buyers identified Convoy Motors as having the best overall service?

Which situation identifies when to use pie charts and\or bar charts?

What are the two most important characteristics to look for in a scatter diagram?

The two most important characteristics revealed by the scatter diagram are the strength and direction of the linear relationship.

Explain why religious preference is not an ordinal variable.

The values of quantitative data are categories.

The largest value of a cumulative relative frequency is ____________________.

Which of the following statements describes a line chart?