5 - Participants

Question 1

Target population
Accessible population
Representative sample

Answer 1

Group defined by researcher’s interests
Local population
Same chars as population

Question 2

Probability sampling

Non probability sampling

Answer 2

1. Odds of selecting a particular individual are known and can be calculated. Random process: every outcome equally likely
2. Odds of selecting a particular individual are not known because pop unknown

Question 3

Simple random sampling

Answer 3

Probability
Each indiv in pop has equal chance of being selected
With/without replacement
Possibility of same result each time

Question 4

Systematic sampling

Answer 4

Selecting every nth name
Divide pop by sample size to get n
Principle of independence violated
Probability

Question 5

Stratified random sampling

Answer 5

Identify subgroups to be included in sample
Then select equal-sized random samples from each group
Combine groups into one sample
Downs: distorted picture of pop, not equal chance of being selected
Probability

Question 6

Proportionate stratified random sample

Answer 6

Subgroups identified
Determine proportions to pop
Proportionate samples obtained
True random sample
Probability

Question 7

Cluster sample

Answer 7

Individuals clustered in preexisting groups
10 classes of 30 third graders instead of 300 individuals
Quick large sample
Measurement can be done in groups, facilitating research project, in one session
Results may not be independent measurements (cheaters)
Probability

Question 8

Combined-strategy sampling

Answer 8

Regions: stratified

Then classes: cluster

Question 9

Why are probability sampling techniques only used for small, contained populations?

Answer 9

Time consuming

Access to whole pop necc

Question 10

Convenience sampling

Answer 10

No randomness
Biased
Most used
Correction for bias with broad cross-section sample
Doesn’t work for sample from unique characteristics (music school)
Or provide clear description of how sample obtained

Question 11

Quota sampling

Answer 11

Subgroups equally represented in convenience sample
Establish quotas for individuals to be selected from subgroups
15 boys/15 girls for 30 preschoolers
Not same as stratified and proportionate stratified sampling because it’s not random selection from pop - it’s convenience
Aka convenience stratified sampling