NAME _____________________________________________ DATE ____________________________ PERIOD _____________
7th Grade PreAP
Lesson 9.5/9.6 Homework
Analyze Data Distributions
1. The number of people that attended the carnival each year is
shown in the graph at the right.
a. Describe the shape of the distribution. Identify any
clusters, gaps, peaks, or outliers.
b. Describe the center and spread of the distribution. Justify
your response based on the shape of the distribution.
2. Mr. Kelly’s homeroom went apple picking. The line plot
shows the number of pounds of apples that were collected.
a. Describe the shape of the distribution. Identify any
clusters, gaps, peaks, or outliers.
b. Describe the center and spread of the distribution. Justify
your response based on the shape of the distribution.
3. The line plot shows the high temperatures for various days
through the summer.
a. Describe the shape of the distribution. Identify any
clusters, gaps, peaks, or outliers.
b. Describe the center and spread of the distribution. Justify
your response based on the shape of the distribution.
Course 3 • Chapter 9 Scatterplots and Data Analysis
NAME _____________________________________________ DATE ____________________________ PERIOD _____________
Random Samples
1. After calling the local hospital to schedule
an appointment, patients are asked to stay
on the line to participate in a brief survey
regarding their experiences with the
hospital. After compiling the results of the
survey, the hospital concluded that 84% of
its patients thought their experiences were
outstanding. Is the hospital’s conclusion
valid? Justify your answer.
2. Every guest at the engineering convention
was assigned a number. At the end of the
convention, one of these numbers was
randomly chosen. The guest matching the
number would win a new laptop
computer. Paul concludes that all the
guests at the convention have an equal
chance of being chosen to win the laptop.
Is Paul’s conclusion valid? Justify your
answer.
3. A reporter from one of the three local news
stations introduced herself as a reporter
from Channel 12 to the attendees of a city
council meeting. After the meeting
recessed, the reporter decided to randomly
survey some of the attendees, asking them
to name their favorite local channel. She
concluded that the city’s favorite is Channel
12. Is her conclusion valid? Justify your
answer.
4. An unbiased, random sample of students is
surveyed about their preference for their
prom theme. The table shows the survey
results. Based upon these results, if there are
600 students in the school, then how many
more will prefer Caribbean to Hollywood?
5. A local textile manufacturer that employs
5,200 people wants to survey its employees
to determine if they would prefer a
company picnic at a water park or at a
horse ranch. Describe one unbiased sample
that the company officials could use to
decide which event to schedule.
6. The results of a survey of a random sample
of tourists at the beaches of a remote are
shown in the table. It can be concluded that
about seventy percent of all tourists at South
Padre Island prefer sunbathing. Determine
whether the conclusion is valid. Justify
your answer.
Prom Theme
Caribbean
Hollywood
Wild West
Activity
Sunbathing
Swimming
Boating
Number of
Students
32
24
19
Tourists
56
18
6
Course 3 • Chapter 9 Scatterplots and Data Analysis