17.

Type of Sampling

Categorize the type of sampling as (Stratified,

Cluster, Convenience,

Systematic or Random) in each of the following situations.

a.

A popular website is interested in conducting a survey of 400 visitors to the site in

such a way that 200 of them will be under age 30, 150 will be aged 30

-

55, and 50

will be

over 55. _____________________________

b.

To maintain quality control in a winery, every 100th bottle of Port wine coming off

the production line was opened and tested.

_____________________________

c.

Viewers of a television show are asked to vote for their fa

vorite performer by

sending a text message to the show. _____________________________

d.

A researcher selects 4 of 12 high schools in a certain region and surveys all of the

administrative staff members in each school about a potential change in the

ordering

of supplies. _____________________________

e.

A pollster obtains a list of registered voters and uses a computer random number

generator to choose 100 of them to ask which candidate they prefer in an upcoming

election. _____________________________