Sampling and Bias

A list of all the population from which a sample is taken

• Sampling Frame

• Systematic

• Cluster

• Stratified

Groups are created based on convenience or location, some group are selected at random, and then all members of the group are used for the sample.

• Simple Random

• Systematic

• Cluster

• Stratified

Groups are created based on something members have in common, and then a random sample of a few members from each group are used for the sample.

• Simple Random

• Systematic

• Cluster

• Stratified

a sample taken by assigning a number to each member and then every nth member is selected

• Simple Random

• Systematic

• Cluster

• Stratified

a sample taken by assigning a number to each member and then random numbers are chosen

• Simple Random

• Systematic

• Cluster

• Stratified

Using a class roster, I number each student and randomly select 5 numbers for my sample.

• Simple Random

• Systematic

• Cluster

• Stratified

A management company wants to randomly drug test its employees. They decide to choose the 4th person that arrives to work for each shift.

• Simple Random

• Systematic

• Cluster

• Stratified

A management company wants to randomly drug test its employees. They randomly select ten stores around the country and survey all the employees that work at those stores.

• Simple Random

• Systematic

• Cluster

• Stratified

A management company wants to randomly drug test its employees. There are four employee classifications: supervisors, full-time clerks, part-time clerks, and maintenance staff. They decide to randomly select ten people from each category.

• Simple Random

• Systematic

• Cluster

• Stratified

A management company wants to randomly drug test its employees. Each employee has a three-digit identification number. They randomly choose 40 numbers.

• Simple Random

• Systematic

• Cluster

• Stratified