Chapter 2 stats lab

In a pie graph, if pepperoni pizza were 24/72 of the distribution, how many degrees would be needed to represent pepperoni?

120

If two classes are 10 - 16 and 17 - 23, then the upper class boundary of 10 - 16 is

16.5

The boundaries of a continuous variable are given in one additional decimal place and always end with the digit

5

The __________ is obtained by first adding the lower and upper limits and then dividing by 2

class midpoint

A grouped frequency distribution is used when the range of the data values is relatively small.

false

A histogram is a graph that represents the cumulative frequencies for the classes in a frequency distribution.

false

The __________ is the number of values in a specific class of distribution.

frequency

The three most commonly used graphs in research are the histogram, the __________, and the cumulative frequency graph (ogive).

frequency polygon

Which type of graph represents the data by using vertical bars of various heights to indicate frequencies?

histogram

Calculators provide the following benefits EXCEPT

interpreting data

The range 33.17 - 35.63 is not a good choice for class boundaries because

it is to difficult to interpret

Exaggerating a one-dimensional increase by showing it in two dimensions is an example of a(n)

misleading graph

The percentage of white, wheat, and rye bread sold at a supermarket each week is best shown using a __________ graph

pie

_________ are used to show the relationship between the parts and the whole.

pie graphs

What are the variables determined by chance called?

random variable

Determine which of the four levels of measurement (nominal, ordinal, interval, ratio) is most appropriate. The number of 'yes' responses when students from a local college are asked if they ever "text" on the phone while driving

ratio

If data is clustered at one end or the other, it indicates that there is a __________.

skewed distribution

The ______ retains the actual data while showing them in graphical form.

stem and leaf plot

Researchers obtain ________ samples by dividing the population into groups according to some characteristic that is important to the study, then sampling from each group.

stratified

A pie graph is not useful to show which of the following characteristics of data

trend of data over time

An ogive is also called a cumulative frequency graph

true

When two sets of data are compared on the same graph using two lines, it is called a compound time series graph

true

A ______ distribution is flat or rectangular.

uniform

Which of the following should not be done when constructing a frequency distribution?

use a class with an even number

ambiguous averages contain all of the following EXCEPT the

variance