Probability and Statistics Chapter 2

What is the midpoint of the classes 4- 16

10

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

120

Karen is constructing a pie graph to represent the number hours her classmates do homework each day. She found that 8/ 24 did homework for 3 hours a day. In her pie graph, this would represent how many degrees

120

What is the lower class limit in the class 13- 17

13

If a frequency distribution had class boundaries of 132.5- 147.5, what would be the class width?

15

What is the midpoint of the classes 13.5- 17.3

15.4

What would be the boundaries on the average age for high school graduates if they were reported to be 18 years old?

17.5- 18.5

For the class 7- 19, the upper class limit is

19

What are the boundaries of the class 3- 15

2.5- 15.5

Using the class 23- 35, what is the upper class boundary?

35.5

An automobile dealer wants to construct a pie graph to represent types if cars sold in July. He sold 72 cars; 16 of which were convertibles. The convertibles will represent how many degrees in the circle

80

Greg wants to construct a frequency distribution for the political affiliation of the employees at Owen's Hardware Store. What type of distribution should he use?

categorical

Thirty students recorded the colors of their eyes, choosing from the colors brown, blue, green, hazel, and black. This data can be appropriately summarized in a _________

categorical frequency distrivution

The range 32.17- 34.63 is not a good choice for class boundaries because __________

class limits are difficult to interpret

Pereto charts have units that are used for the frequency that are ________ in size

equal

A grouped frequency distribution is used when the range for data is relatively small

false

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

false

A histogram uses the midpoints for the x values and the frequencies ad the y values

false

A pereto chart is useful for showing percentages of the total

false

A pie graph is useful to show the trend of the data over time

false

A pie graph would best represent the number of inches of rain that has fallen in Ohio each day for the past 2 months

false

An ogive and a frequency polygon have the same overall shape

false

For the class 16.3- 23.8, the width is 7

false

On a pereto chart the frequencies are arranged from lowest to highest

false

When constructing a frequency distribution the class width should be an even number

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

frequency polygon

When the range is large and the classes that are several units in width are needed, a _____________ frequency distribution is used

grouped

What time of graph represents the data by using vertical bars of various heights to indicate frequencies

histogram

The ____________ is obtained by adding the lower and upper limits and then dividing by two

midpoint

Exaggerating a one dimensional increase by showing it in two dimensions is an example of a

misleading graph

Which graph should be used to represent the frequencies that certain types of classes are taken at Highlands Middle School

pareto chart

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

pie

When data are collected in original form, they are called

raw data

The graphs that have their distributions as proportions instead of raw data as frequencies are called ________

relative frequency graph

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

skewed distribution

A ____________ would most appropriately represent the number of students that were enrolled in stats for the past 10 years

time series

A weatherman records the amount of rain that has fallen in Oregon during each day. What type of graph should he use?

time series graph

A frequency polygon and a histogram have the same overall shape

true

A pereto chart arranges data from largest to smallest according to frequencies

true

A pie graph was created showing the number of children per family. If 234 families were in the survey and the section depicting families with three children represented 120°, the number of families with three children was 78.

true

A stem and leaf plot is useful for keeping more precision than a grouped frequency distribution

true

A time series graph is useful for detecting long term trends over a period of time

true

A time series graph is useful for representing the frequencies of a data category over a period of several years

true

A time series graph represents data that occur over a specific period

true

An ogive graph is also called a cumulative frequency graph

true

Graphs give a visual representation that enables readers to analyze and interpret data more easily than they could simply by looking at numbers

true

If the limits for a class were 20- 38, the boundaries would be 19.5- 38.5

true

The cumulative frequency is the sum of the frequencies accumulated to the upper boundary of a class in the distribution

true

The frequency polygon is a graph that displays the data by using lines that connect points plotted for the frequencies at the midpoints of the classes

true

The lower class limit represents the smallest data value that can be included in the class

true

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

true

What is the lower class limit in the class -6 to 9

-6