Sampling techniques

What is this type of sampling? "sample is selected by pure randomness using any methods to draw out the more random sample"

• random sampling

• systematic sampling

• stratified sampling

• cluster sampling

Two advantages of random sampling are

Two disadvantages of random sampling are

Answer explanation

unequal representation of all groups

needs up-to-date sampling frame

What type of sampling is this? "when someone choose sample based on their position on a whole list (e.g: every 36th member)"

• random sampling

• systematic sampling

• stratified sampling

• cluster sampling

Two advantages of systematic samplings are

Two disadvantages of systematic sampling

Answer explanation

unequal representation of some groups

needs up-to-date sampling frame

What type of sampling is this? "Divide population into smaller sub-groups (strata), then draw sample randomly from the strata"

• random sampling

• systematic sampling

• stratified sampling

• cluster sampling

Two advantages of stratified sampling are:

Answer explanation

ensure of the control of variables

high precision & representativeness

Three disadvantages of stratified sampling are

Answer explanation

complex & time-consuming when people have to be divided into strata

sampling frame might not provide enough information to form strata

the formation of strata might be subjective

What type of sampling is this? "Clusters are formed from population with similar characteristics. A random sample of the cluster is selected. Observation of selected clusters are included in sample"

• random sampling

• systematic sampling

• stratified sampling

• cluster sampling