Surveys and Sampling Methods

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Chapter 1
Sample and Display Data

2. Section 1-1
Surveys and Sampling Methods

3. Essential Questions
What are the different sampling methods?
What are biased surveys?
Where you’ll see this:
Manufacturing, research, marketing, politics

4. Vocabulary
1. Population:
2. Sample:
3. Biased:
4. Unbiased:

5. Vocabulary
1. Population: A group that represents the whole of what you are
collecting data on
2. Sample:
3. Biased:
4. Unbiased:

6. Vocabulary
1. Population: A group that represents the whole of what you are
collecting data on
2. Sample: A small part of the population that can represent the whole
3. Biased:
4. Unbiased:

7. Vocabulary
1. Population: A group that represents the whole of what you are
collecting data on
2. Sample: A small part of the population that can represent the whole
3. Biased: A result that is gotten when the sample does not represent
the whole group
4. Unbiased:

8. Vocabulary
1. Population: A group that represents the whole of what you are
collecting data on
2. Sample: A small part of the population that can represent the whole
3. Biased: A result that is gotten when the sample does not represent
the whole group
4. Unbiased: A result that is gotten when the sample does represent
the whole group

9. Four Methods of Sampling

10. Four Methods of Sampling
Method Explanation Example
Equal chance to be Draw names from hat;
Random Sampling
selected each name in once
Particular parts of the Ask students from 3
Cluster Sampling
pop. are chosen from classes to rep. entire
Convenience (Lazy) Chosen as they are Ask students who are
Sampling readily available in library pd. 4
A pattern is used to Ask every 3rd student
Systematic Sampling
choose that enters doorway

11. Four Methods of Sampling
Method Explanation Example
Equal chance to be Draw names from hat;
Random Sampling
selected each name in once
Particular parts of the Ask students from 3
Cluster Sampling
pop. are chosen from classes to rep. entire
Convenience (Lazy) Chosen as they are Ask students who are
Sampling readily available in library pd. 4
A pattern is used to Ask every 3rd student
Systematic Sampling
choose that enters doorway

12. Four Methods of Sampling
Method Explanation Example
Equal chance to be Draw names from hat;
Random Sampling
selected each name in once
Particular parts of the Ask students from 3
Cluster Sampling
pop. are chosen from classes to rep. entire
Convenience (Lazy) Chosen as they are Ask students who are
Sampling readily available in library pd. 4
A pattern is used to Ask every 3rd student
Systematic Sampling
choose that enters doorway

13. Four Methods of Sampling
Method Explanation Example
Equal chance to be Draw names from hat;
Random Sampling
selected each name in once
Particular parts of the Ask students from 3
Cluster Sampling
pop. are chosen from classes to rep. entire
Convenience (Lazy) Chosen as they are Ask students who are
Sampling readily available in library pd. 4
A pattern is used to Ask every 3rd student
Systematic Sampling
choose that enters doorway

14. Four Methods of Sampling
Method Explanation Example
Equal chance to be Draw names from hat;
Random Sampling
selected each name in once
Particular parts of the Ask students from 3
Cluster Sampling
pop. are chosen from classes to rep. entire
Convenience (Lazy) Chosen as they are Ask students who are
Sampling readily available in library pd. 4
A pattern is used to Ask every 3rd student
Systematic Sampling
choose that enters doorway

15. Four Methods of Sampling
Method Explanation Example
Equal chance to be Draw names from hat;
Random Sampling
selected each name in once
Particular parts of the Ask students from 3
Cluster Sampling
pop. are chosen from classes to rep. entire
Convenience (Lazy) Chosen as they are Ask students who are
Sampling readily available in library pd. 4
A pattern is used to Ask every 3rd student
Systematic Sampling
choose that enters doorway

16. Four Methods of Sampling
Method Explanation Example
Equal chance to be Draw names from hat;
Random Sampling
selected each name in once
Particular parts of the Ask students from 3
Cluster Sampling
pop. are chosen from classes to rep. entire
Convenience (Lazy) Chosen as they are Ask students who are
Sampling readily available in library pd. 4
A pattern is used to Ask every 3rd student
Systematic Sampling
choose that enters doorway

17. Four Methods of Sampling
Method Explanation Example
Equal chance to be Draw names from hat;
Random Sampling
selected each name in once
Particular parts of the Ask students from 3
Cluster Sampling
pop. are chosen from classes to rep. entire
Convenience (Lazy) Chosen as they are Ask students who are
Sampling readily available in library pd. 4
A pattern is used to Ask every 3rd student
Systematic Sampling
choose that enters doorway

18. Four Methods of Sampling
Method Explanation Example
Equal chance to be Draw names from hat;
Random Sampling
selected each name in once
Particular parts of the Ask students from 3
Cluster Sampling
pop. are chosen from classes to rep. entire
Convenience (Lazy) Chosen as they are Ask students who are
Sampling readily available in library pd. 4
A pattern is used to Ask every 3rd student
Systematic Sampling
choose that enters doorway

19. Four Methods of Sampling
Method Explanation Example
Equal chance to be Draw names from hat;
Random Sampling
selected each name in once
Particular parts of the Ask students from 3
Cluster Sampling
pop. are chosen from classes to rep. entire
Convenience (Lazy) Chosen as they are Ask students who are
Sampling readily available in library pd. 4
A pattern is used to Ask every 3rd student
Systematic Sampling
choose that enters doorway

20. Four Methods of Sampling
Method Explanation Example
Equal chance to be Draw names from hat;
Random Sampling
selected each name in once
Particular parts of the Ask students from 3
Cluster Sampling
pop. are chosen from classes to rep. entire
Convenience (Lazy) Chosen as they are Ask students who are
Sampling readily available in library pd. 4
A pattern is used to Ask every 3rd student
Systematic Sampling
choose that enters doorway

21. Four Methods of Sampling
Method Explanation Example
Equal chance to be Draw names from hat;
Random Sampling
selected each name in once
Particular parts of the Ask students from 3
Cluster Sampling
pop. are chosen from classes to rep. entire
Convenience (Lazy) Chosen as they are Ask students who are
Sampling readily available in library pd. 4
A pattern is used to Ask every 3rd student
Systematic Sampling
choose that enters doorway

22. Four Methods of Sampling
Method Explanation Example
Equal chance to be Draw names from hat;
Random Sampling
selected each name in once
Particular parts of the Ask students from 3
Cluster Sampling
pop. are chosen from classes to rep. entire
Convenience (Lazy) Chosen as they are Ask students who are
Sampling readily available in library pd. 4
A pattern is used to Ask every 3rd student
Systematic Sampling
choose that enters doorway

23. Four Methods of Sampling
Method Explanation Example
Equal chance to be Draw names from hat;
Random Sampling
selected each name in once
Particular parts of the Ask students from 3
Cluster Sampling
pop. are chosen from classes to rep. entire
Convenience (Lazy) Chosen as they are Ask students who are
Sampling readily available in library pd. 4
A pattern is used to Ask every 3rd student
Systematic Sampling
choose that enters doorway

24. Four Methods of Sampling
Method Explanation Example
Equal chance to be Draw names from hat;
Random Sampling
selected each name in once
Particular parts of the Ask students from 3
Cluster Sampling
pop. are chosen from classes to rep. entire
Convenience (Lazy) Chosen as they are Ask students who are
Sampling readily available in library pd. 4
A pattern is used to Ask every 3rd student
Systematic Sampling
choose that enters doorway

25. Example 1
A publisher wants to know which types of books are most popular
with high school students. Listed are three ideas for collecting data.
Identify the sampling method represented by each.
a. Dial phone numbers at random across the country and ask to
speak to a teenager.
b. Choose twenty high schools at random across the country and
survey each student in each school.
c. Give questionnaires one afternoon to all HS students visiting the
White House on class trips to Washington, DC.

26. Example 1
A publisher wants to know which types of books are most popular
with high school students. Listed are three ideas for collecting data.
Identify the sampling method represented by each.
a. Dial phone numbers at random across the country and ask to
speak to a teenager.
Random Sampling
b. Choose twenty high schools at random across the country and
survey each student in each school.
c. Give questionnaires one afternoon to all HS students visiting the
White House on class trips to Washington, DC.

27. Example 1
A publisher wants to know which types of books are most popular
with high school students. Listed are three ideas for collecting data.
Identify the sampling method represented by each.
a. Dial phone numbers at random across the country and ask to
speak to a teenager.
Random Sampling
b. Choose twenty high schools at random across the country and
survey each student in each school.
Cluster Sampling
c. Give questionnaires one afternoon to all HS students visiting the
White House on class trips to Washington, DC.

28. Example 1
A publisher wants to know which types of books are most popular
with high school students. Listed are three ideas for collecting data.
Identify the sampling method represented by each.
a. Dial phone numbers at random across the country and ask to
speak to a teenager.
Random Sampling
b. Choose twenty high schools at random across the country and
survey each student in each school.
Cluster Sampling
c. Give questionnaires one afternoon to all HS students visiting the
White House on class trips to Washington, DC.
Convenience Sampling

29. Example 2
The table shows the results of a survey of 300 Americans asked to
name their favorite spectator sport.
Sport Percent Favorite
Basketball 32%
Baseball 28%
Football 22%
Other 6%
Soccer 5%
Tennis 4%
Golf 3%

30. Example 2
a. How many of those surveyed chose baseball as their favorite sport?
b. If the survey was unbiased, how many of 5000 Americans might
be expected to choose soccer as their favorite spectator sport?

31. Example 2
a. How many of those surveyed chose baseball as their favorite sport?
300(.28)
b. If the survey was unbiased, how many of 5000 Americans might
be expected to choose soccer as their favorite spectator sport?

32. Example 2
a. How many of those surveyed chose baseball as their favorite sport?
300(.28) = 84
b. If the survey was unbiased, how many of 5000 Americans might
be expected to choose soccer as their favorite spectator sport?

33. Example 2
a. How many of those surveyed chose baseball as their favorite sport?
300(.28) = 84 people chose baseball
b. If the survey was unbiased, how many of 5000 Americans might
be expected to choose soccer as their favorite spectator sport?

34. Example 2
a. How many of those surveyed chose baseball as their favorite sport?
300(.28) = 84 people chose baseball
b. If the survey was unbiased, how many of 5000 Americans might
be expected to choose soccer as their favorite spectator sport?
5000(.05)

35. Example 2
a. How many of those surveyed chose baseball as their favorite sport?
300(.28) = 84 people chose baseball
b. If the survey was unbiased, how many of 5000 Americans might
be expected to choose soccer as their favorite spectator sport?
5000(.05) = 250

36. Example 2
a. How many of those surveyed chose baseball as their favorite sport?
300(.28) = 84 people chose baseball
b. If the survey was unbiased, how many of 5000 Americans might
be expected to choose soccer as their favorite spectator sport?
5000(.05) = 250 people prefer soccer

37. Problem Set

38. Problem Set
p. 8 #1-25
“I have found power in the mysteries of thought.” - Euripides