Statistics Midterm Study Guide Chapter 2

What are the boundaries of the class 1.87-3.43?

1.865-3.435

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

12.5

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

120 degrees

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

120 degrees

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

15

What is the midpoint of classes 13.5-17.3

15.4

Determine the range for this data: 4, 7, 3, 16, 5, 22, and 8.

19

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 of cars sold in July. He sold 72 cars; 16 of which were convertibles. The convertibles will represent how many degrees in the circle?

80 degrees

When data are collected in original form, they are called ___________. A) Datum B) Numbers C) Raw data D) Categories

C) Raw data

Which of the following should not be done when constructing a frequency distribution? A) select the number of classes desired B) find the range C) use a class width with an even number D) use classes that are mutually exclusive

C) use a class width with an even number

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?

Categorial

The ____________ is the number of values in a specific class of distribution. A) Midpoint B) Class width C) Raw data D) Frequency

D) Frequency

(True or False) A grouped frequency distribution is used when the range of the data values is relatively small.

False

(True or False) A histogram is a graph that represents the cumulative frequencies for the classes in a frequency distribution.

False

(True or False) A histogram uses the midpoints for the x values and the frequencies as the y values.

False

(True or 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

(True or False) For the class 16.3-23.8, the width is 7.

False

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

Frequency pologon

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

Grouped

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

Midpoint

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

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 percentage or white, wheat, and rye bread sold at a supermarket each week is best shown using a _______________ graph.

Pie chart

If data is clustered at one end or the other, it is said to be ___________.

Skewed.

A _____________ would most appropriately represent the number of students that were enrolled in Statistics for the past ten years.

Time series

(True or False) A Pareto chart arranges data from the largest to smallest according to frequencies.

True

(True or False) A pie graph was created showing the humber of children per family. If 234 families were in the survey and the section depicting families with three children represented 120 degrees, the number of families with three children was 78.

True

(True or False) A time series graph represents data that occur over a specific period.

True

(True or False) An ogive graph is also called a cumulative frequency graph.

True

(True or False) Graphs give a visual representation that enables readers to analyze and interpret data more easily than they could simply by looking at numbers.

True

(True or False) The cumulative frequency is the sum of the frequencies accumulated to the upper boundary of a class in the distribution.

True

(True or False) 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

(True or False) The lower class limit represents the smallest data value that can be included in that class.

True

(True or False) When two sets of data are compared on the same graph using two lines, it is called compound time series graph.

True

(True or False) if the limits for a class were 20-38, the boundaries would be 19.5-38.5.

True

Pareto charts have units that are used for the frequency that are

decreasing in size

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

histogram

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

relative frequency graphs

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

time series graph