Ch1 Data collection

Question 1

systematic sampling

Answer 1

regular intervals in a list

Question 2

Systematic -

Answer 2

sampling frame needed
can be biased

Question 3

Systematic +

Answer 3

Simple and quick
Good for large samples

Question 4

Simple random sampling

Answer 4

every sample size of n has an equal chance of being selected

Question 5

Simple random +

Answer 5

No bias
Easy and cheap for small popn

Question 6

Simple random -

Answer 6

Long and expensive for large popn
sample frame needed

Question 7

Stratified sampling

Answer 7

popn divided into mutaly exclusive strata and random sample taken from each

Question 8

Stratified -

Answer 8

Long and expensive for large popn
sample frame needed

Question 9

stratified +

Answer 9

accurately reflects popn
has proportional groups

Question 10

quota sampling

Answer 10

sample that reflects characteristics of population

Question 11

quota +

Answer 11

no sampling frame
quick and easy
allows groups comparison

Question 12

quota -

Answer 12

biased
non-responses aren’t recorded

Question 13

opportunity sampling

Answer 13

available people who fit critera

Question 14

opportunity +

Answer 14

easy and cheap

Question 15

opportunity -

Answer 15

unlikely representative
dependent on researcher