Exam 2: Organizing and Visualizing Data

Scott Brim, Chief Financial Officer of Space Mall, Inc., wants to better understand the biest business hours during the weekend. There are door sensors that approximately count the number of people who enter the mall. The table below presents the average number of people coming in during the weekend, for the last month: The relative frequency of the fourth class interval is ___.

The 2010 and 2012 market share data of the three competitors (Alston, Baren, and Clemson) in an oligopolistic industry are presented in the following pie charts. Total sales for this industry were $1.5 billion in 2010 and $1.8 billion in 2012. Clemson's sales in 2010 were ___.

Categorical data

The staff of Mr. Wayne Wertz, VP of Operations at Portland Peoples Bank, prepared a cumulative frequency ogive of waiting time for walk-in customers. The percentage of walk-in customers waiting one minute or less was ___.

An instructor made a frequency table of the scores his students got on a test: The midpoint of the last class interval is ___.

The class mark is the ___, and it is ___.

An instructor has decided to graphically represent the grades on a test. The instructor uses a plus/minus grading system (i.e. she gives grades of A-, B+, etc.). Which of the following would provide the most information for the students?

A graphical representation of a frequency distribution is called a pie chart.

A scatter plot is useful for examining the relationship between two numerical variables.

The number of phone calls arriving at a switchboard each hour has been recorded, and the following frequency distribution has been developed. What is the relative frequency of the second class?

Pinky Bauer, Chief Financial Officer of Harrison Haulers, Inc., suspects irregularities in the payroll system and orders an inspection of "each and every payroll voucher issued since January 1, 2000." Each payroll voucher was inspected and the following frequency distribution was compiled. The relative frequency of the first class interval is ___.

Your company is doing market research to assess the feasibility of a new product. The market research team gathers pricing information of all the existing products that would compete with your company's product. The most expensive brand is priced at $22.95, and the least expensive one at $20.59. If a class width of 0.25 is used, then the number of classes will be

In a frequency distribution, the first class interval begins at 18. The midpoint of the first class interval is 19.5, and the last class interval ends at 51. How many class intervals are there?

Given two class intervals and their respective frequencies and relative frequencies, the ratio of the frequencies ___ the ratio of the relative frequencies.

The following graphic of PCB Failures is a ___.

A scatter plot is a two-dimensional graph plot of data containing pairs of observations on two numerical variables.

A summary of data in which raw data are grouped into categories and the number of items in each category is listed is called a

For any given data set, a frequency distribution with a larger number of classes will always be better than the one with a smaller number of classes.

The number of phone calls arriving at a switchboard each hour has been recorded, and the following frequency distribution has been developed. What is the midpoint of the last class?

A frequency distribution was developed. The lower endpoint of the first class is 9.30, and the midpoint is 9.35. What is the upper endpoint of this class?