Chapter 2

Question 1

Ways to organize qualitative data..

Answer 1

Tables
Graphs
Numerical summaries (chapter 3)

Question 2

A ________________ is a table listing each category of data and the number of occurrences for each category of data

Answer 2

Frequency distribution

Question 3

How do you find relative frequency?

Answer 3

Frequency divided by sum of all frequencies

Question 4

A type of bar graph where the bars are drawn in decreasing order of frequency or relative frequency

Answer 4

Pareto chart

Question 5

The “whole pie” in a pie chart represents ____% or ____

Answer 5

100, 1

Question 6

Is constructed by drawing rectangles for each class of data. The height of each rectangle is the frequency or relative frequency of a class. The width of each rectangle is the same* and the rectangles touch each other***

Answer 6

Histograms of discrete data

Question 7

Classes are created when…

Answer 7

Data set consist of a large number of different discrete data values or when a data set consists of continuous data

Question 8

Is the difference between consecutive lower class limits. There should be no overlap!

Answer 8

Class width

Question 9

True or false…

There is not one correct frequency distribution for a particular set of data

Answer 9

True

However, some frequency distributions can better illustrate patterns within the data than others. So constructing frequency distributions is somewhat of an artform.

Question 10

How to determine the class width

Answer 10

Class width = largest data set - smallest data value

Divided by

Number of classes

Question 11

What is an advantage of stem-and-leaf diagrams over histograms?

Answer 11

Raw data can be retrieved

Question 12

In frequency polygons the class midpoint is the…

Answer 12

Adding the two lower class limits next to each other, divided by two

Question 13

Is a graph that uses points, connected by line segments, to represent the frequency of the class. It is constructed by putting a point above each class midpoint on a horizontal axis at a height equal to the frequency of the class. Next, line segments are drawn connecting each end of the graph with the horizontal axis.

Answer 13

Frequency polygon

Question 14

Is a graph that represents the cumulative frequency or cumulative relative frequency for the class

Answer 14

Frequency and relative frequency ogives*

Question 15

If the value of a variable is measured at different points in time, the data are referred to as…

Answer 15

Time series data

Question 16

Is obtained by putting the time in which a variable is measured on the horizontal axis in the corresponding value of the variable on the vertical axis

Answer 16

Time series plot