Question

what is a stratified sample? *
all members of the population have an equal chance of selection
a population is divided into groups and members of the sample are randomly selected from each group.
a population is divided into groups and only some of the groups are chosen for the sample
each member of the population is assigned a number and every n th member is chosen for the sample

a television reporter interviewed travellers stranded at an airport during a snowstorm about the efficiency of air travel in canada. name the sampling techniques used.
a. systematic sample
b. cluster sample
c. stratified sample
d. simple radom sample
e. convenience sample

Explanation:

A stratified sample divides a population into groups (strata) based on certain characteristics and then randomly selects members from each group. For the second - part, interviewing travellers stranded at an airport during a snowstorm is a convenience sample as it is based on easy access to the sample group.

Answer:

1. A population is divided into groups and members of the sample are randomly selected from each group.
2. e. Convenience Sample