Research

what is a sample?

• A process of examining every person in the population.

• It is a group or class of subjects, variables, concepts, or phenomena.

• A subset of the population which is considered to be representative of the whole population.

• A phenomenon which could be used to highlight the importance of research

It is unrealistic to collect data from the entire population because it is:

• Big, takes time, costs money

• Small, boring, effortless

• Medium, engaging, cheap

• Big, doesn’t take time, subjective

while sampling it is important to be biased?

• True

• False

probability sampling is not based on:

• mathematical guidelines

• Sampling error

• Generalization

• Specified metrics

Non probability sample does not follow any mathematical guidelines

• True

• False

These are all examples of non-probability sampling except

• available

• Volunteer

• Snowball

• Cluster

Purposive sample is

• selected non-randomly and for specific characteristics or qualities, and eliminates those who fail to meet these criteria

• selected randomly and for specific characteristics or qualities, and eliminates those who fail to meet these criteria

• selected non-randomly and for specific characteristics or qualities, and does not eliminate those who fail to meet these criteria

• selected randomly and for specific characteristics or qualities, and does not eliminate those who fail to meet these criteria

These are all examples of probability sampling except

• Systematic

• Simple random

• Snowball

• Stratified

The following are steps to simple random except

• A list of the population is required

• The table of random number

• Select a random starting point

• Select the numbers not needed

what is a disadvantage of cluster sampling

• Only part of the population need be enumerated.

• - Each subject or unit must be assigned to a specific cluster.

• Costs are reduced if clusters are well defined.

• Estimates of cluster parameters are made and compared to the population.