BUS 245 Chapter 2 Exam #1

Stem and leaf data can be used to determine...

- how dispersed the data is - observe individual points - analyzing the shape of the data

Guidelines for constructing a Frequency Distribution

-Classes are mutually exclusive -Classes are exhaustive

Which of the following graphical depictions are useful to observe the shape (distribution) of a data set for a single variable?

-Stem and leaf plot -Histogram - Polygon

One of the primary goals when constructing a frequency distribution for quantitative data is to summarize the data in a manner that...

accurately depicts the data as a whole

Polygon

connects a series of neighboring points where each point represents the midpoint of a particular class and its associated frequency or relative frequency.

Ogive

connects a series of neighboring points where each point represents the upper limit of a particular class and its associated cumulative frequency or cumulative relative frequency.

Pie Chart

is a segmented circle whose segments portray the relative frequencies of the categories of some qualitative variable.

A--- is a type of graph that allows research to examine the relationship between two variables

scatterplot

An ogive is a graph that plots the cumulative frequency, or relative cumulative frequency against the

upper limit of the corresponding class

frequency distribution

A table that groups qualitative data into categories, or quantitative data into intervals called classes, where the number of observations that fall into each category or class is recorded. Largest value- Smallest Value -------------------------------- Number of classes

What graphical tool is best used to display the relative frequency of grouped, quantitative data ?

Histogram

Which of the following graphical depictions is useful for observing the spread of data from a single variable?

Histogram

What best describes a frequency distribution for qualitative data ?

It groups data into categories, and records the number in each category

One method of graphical presentation is a(n)...

Pie Chart

A cumulative relative frequency distribution for quantitative data identifies the...

Proportion of observations that fall below the upper under limit of each class

Cumulative frequency distribution

a distribution showing the frequency at or below each category (class interval or score) of the variable

In a random survey 500 people, 75 of the people stated that laundry detergent was their preferred brand when compared to other laundry detergents. If a pie chart of laundry detergent preferences is created based on the survey, what is the appropriate number of degrees in a circle to represent the preference for Clean detergent?

75/500=0.15.... 0.15x360= 54

relative frequency distribution

A frequency distribution that shows the fraction of observations (proportion) of observations in each category of qualitative data Class Frequency -------------------- Total # of observations

Bar Chart

A graph that depicts the frequency or relative frequency of each category of qualitative data as a series of horizontal or vertical bars, the lengths of which are proportional to the values that are to be depicted.values are represented by horizontal or vertical rectangles.

Histogram

A graphical depiction of a frequency or relative frequency distribution; it is a series of rectangles where the width and height of each rectangle represent the class width and frequency (or relative frequency) of the respective class.