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Examples Are Your Friends

Study the examples for detailed instruction, with text and video guidance, for every concept and
skill in the course.

Examples are the heart of the program.
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EXAMPLES. Each example title is followed by the
content and skills being taught and a “play button” link
to a Worked Example Video. These videos were

®
prepared by experienced AP Statistics teachers, to help
you study, review, and get extra help, when needed.
6 UNIT 1 Exploring One-Variable Data

We can use a frequency table or a relative frequency table to help describe the
distribution of a variable, as the following example illustrates.

EXAMPLE call me, maybe? Skills 2.A, 2.B
Summarizing data with tables

PROBLEM: Here are the data on preferred method of communicating

with friends for all 50 students in the Census at School sample:
Internet chat/IM In person In person Internet chat/IM Phone call
Text messaging Text messaging Text messaging Social media Social media
Text messaging Text messaging Text messaging In person In person
Text messaging Text messaging Text messaging In person In person SDI Productions/E+/Getty Images
Text messaging Text messaging Internet chat/IM Social media Text messaging
Text messaging Text messaging In person Text messaging Internet chat/IM
Text messaging Social media Text messaging Social media Text messaging
Text messaging In person Social media In person Text messaging
Text messaging Text messaging Text messaging Internet chat/IM In person
Text messaging In person Internet chat/IM Text messaging In person THE VOICE OF THE TEACHER. Pay
special attention to the carefully placed
(a) Make a frequency table and a relative frequency table to summarize the distribution of preferred
communication method. “teacher talk” boxes that guide you
(b) Do these data support the claim that a majority of students prefer to communicate with their friends using text through the solution. These comments
messaging? Justify your answer.
offer lots of good advice — as if your
SOLUTION:
(a) Frequency table The frequency table shows the number of students who prefer teacher is working directly with you to
Preferred method Frequency each communication method. To create the frequency table, count solve a problem.
In person 12 how many students said “In person,” how many said “Internet chat
Internet chat/IM 6 or instant messenger,” and so on. Note that the SOLUTION is presented in
Phone call 1
Social media 6 a special font to model the style, steps,
Text messaging 25 and language you should use to earn
Total 50
®
full credit on the AP Statistics exam.
Relative frequency table
The relative frequency table shows the proportion or percentage
Preferred method Relative frequency of students who prefer each communication method. Note that in
In person 12/50 = 0.24 or 24% statistics, a proportion is a value between 0 and 1 that is equiva-

Internet chat/IM 6/50 = 0.12 or 12% lent to a percentage.

Phone call 1/50 = 0.02 or 2%

Social media 6/50 = 0.12 or 12% PRACTICE! Take time to work the
Text messaging 25/50 = 0.50 or 50% paired problem in the Section Exercises.

Total 50/50 = 1.00 or 100%

(b) No. Exactly 50% of the students in the sample said that they prefer to communicate with their friends Practicing a similar problem after
via text messaging, but a majority is more than half. studying the worked example helps you
FoR PRAcTIce, TRY eXeRcISe 5 know whether or not you’ve “got it.”
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