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8.3 Using Statistics to Predict
Predict actions of a larger
group by using a sample
Turn and Talk• What shows do you watch on tv?
• Do you have any restrictions on what you watch on tv?
• Do you have any restrictions on how much tv you watch?
• How are tv ratings determined?
Television Ratings
• http://www.digitalspy.co.uk/forums/showthread.php?t=208480
Many kids watch TV unrestricted
• Nearly half of children 8 to 17 have no parental restrictions on how much TV they watch or what programs or channels they watch.
No restrictions 46%
Some restrictions 54%
What ages of kids are represented?
• Nearly half of children 8 to 17 have no parental restrictions on how much TV they watch or what programs or channels they watch.
No restrictions 46%
Some restrictions 54%
Can you tell how many were surveyed? Explain.
• Nearly half of children 8 to 17 have no parental restrictions on how much TV they watch or what programs or channels they watch.
No restrictions 46%
Some restrictions 54%
Describe how you could use the graphic to predict how many students in
your school have no restrictions on their television viewing.
• Nearly half of children 8 to 17 have no parental restrictions on how much TV they watch or what programs or channels they watch.
No restrictions 46%
Some restrictions 54%
Quickwrite
• Create a definition for each of the following– SURVEY
– POPULATION
– RANDOM SAMPLE
T-table
Random Sample
Examples Non Example
Example 1. Predict how many of the 1,250 Gallatin Middle School students
have some restrictions on the television that they watch.
No restrictions 46%
Some restrictions 54%
Example 2. Predict how many of the 1,250 Gallatin Middle School students have no restrictions on the television
that they watch.
No restrictions 46%
Some restrictions 54%
The table shows the results of a survey in which people were asked whether
their house pets watch television.• Predict how
many of the 540 people surveyed said their pets watch TV.
Does your pet watch television?
Response Percent
Yes 38%
No 60%
Don’t know 2%
A survey showed that 70% of people 12 to 17 years old use the internet to send instant messages. Predict how many of the 2,640 students at Washington
Middle School send instant messages.
According to one survey, 25% of high school students reported they would not get a summer job. Predict how
many of the 948 students at Mohawk High School will not get a summer job.
Workbook 8-3
Journal
• How accurate do the predictions seem to be?
• How does the # of people surveyed affect predictions?
Homework
• P 346: 1-14 (skip 2)
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