Unit 3.2c

Question 1

When would you use a representative sample?

Answer 1

When it’s impractical to measure every individual in the population

Question 2

What should you do if there is a large amount of variety in a population?

Answer 2

Use a larger sample size

Question 3

What sampling allows members of a population an equal chance of being selected?

Answer 3

Random sampling

Question 4

When is random sampling effective?

Answer 4

In large groups with uniform distribution

Question 5

What 2 advantages of random sampling?

Answer 5

• straight forward
• no bias

Question 6

What’s a disadvantage of random sampling?

Answer 6

Results in poor representation of the overall population

Question 7

What sampling means members of a population are selected at regular intervals?

Answer 7

Systematic sampling

Question 8

What’s an advantage of systematic sampling?

Answer 8

Provides a more representative sample of the overall population

Question 9

What 2 disadvantages of systematic sampling?

Answer 9

• not all members have an equal selection chance
• subject to selection bias

Question 10

What sampling divides the entire population into different sub groups, and then randomly select the final subjects proportionally from the different groups?

Answer 10

Stratified sampling

Question 11

What’s an advantage of stratified sampling?

Answer 11

Highly representative of the overall population

Question 12

What’s 2 disadvantages of stratified sampling?

Answer 12

• requires researchers to know the proportions of each group prior to sampling
• Must have up-to-date population data