# W2 - Sampling Flashcards

Where do you draw your sample from?

Population of interest

What does the type of sampling method used depend on?

Research Q

Money + time available to spend on sampling procedure

Why sample?

Rarely have access to the whole population that were interested in

Define a sample

Group of participants selected from a larger population

Define inference

Extent to which the sample characteristics reflect those of the population

What are the types of sampling

Probability

Non-probability

Probability sampling

Selecting from a pop where each member has a chance of being selected.

Probability of selection is known.

Non-probability sampling

Researcher doesn’t know what population size is + doesn’t have access to it.

Probability of selection is UNKOWN.

What are the types of probability sampling

Simple random

Stratified random

Systematic

Cluster

What are the types of non-probability sampling?

Convenience

Snowball

Simple random sampling

All members of pop has equal chance for being selected

Problem with simple random sampling

Could be unrepresentative of the population

How would a sample being “unrepresentative of the population” be minimised?

Larger sample groups

Strengths to simple random sampling

Easy

Large samples likely to be representative

No info needed prior to sampling

Weakness to simple random sampling

Larger samples often needed = small samples could be unrepresentative

Comparisons between small subgroups may be difficult