Public Strategies recently conducted a statewide telephone poll in Texas to inve

Question

Public Strategies recently conducted a statewide telephone poll in Texas to investigate the Texas Governor’s race. The sample included 704 registered voters across Texas. The sampling was done to ensure that the sample was representative of the population of Texas in terms of gender, age, ethnicity and party affiliation. Given this information, which sampling method best describes the telephone poll by Public Strategies? __________

a. Simple random sampling b. Systematic random sampling c. Stratified random sampling d. Cluster sampling

Explanation / Answer

Ans C . Stratified Random Sampling.

Simple Random Sampling: Every member of the population is equally likely to be selected. This will not guarantee that the sample was representative of the population in terms of gender age, ethnicity and party affiliation

Systematic random sampling : Simple Random Sampling in an ordered systematic way, e.g. every 100th name in the yellow pages . This will also not guarantee that the sample was representative of the population in terms of gender age, ethnicity and party affiliation

C.  Stratified random sampling : Population divided into different groups from which we sample randomly , This is most appropriate as the the population can be divided into groups based on gender, age, ethnicity and party affiliation. And by this the sample is going to be a representative of the population of Texas in terms of gender, age, ethnicity and party affiliation.

D. Cluster Sampling: Population is divided into (geographical) clusters - some clusters are chosen at random - within cluster units are chosen with Simple Random Sampling . Compared to Stratified sampling it has drawbacks in terms :

Cluster sampling:

Cheaper

Usually not representative of whole population

Stratified sampling:

Sample more representative

Good information on subgroups

Hence , Stratified sampling method best describes the telephone poll by Public Strategies as this method of sampling would be representative of the population of Texas in terms of gender, age, ethnicity and party affiliation.

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