When selecting a sample, there are several methods of selectionavailable.
A company with hundreds of employees has hired a third partyhuman resources agency. The agency is to study the employees andtheir level of job satisfaction, and to discover if the companyneeds to change anything about its management of humanresources.
As part of this study, the agency wants to survey a selection ofemployees from within the company. Four members of the agencypropose four different sampling plans for the survey.
Alvin: 'The marketing department of the company is reflective ofthe rest of the company in terms of job satisfaction. We shouldsimply survey that department.'
Bonnie: 'We have access to the names of every employee in thecompany. We should survey 50 people from the company by puttingevery name in a list and choosing 50 names completely atrandom.'
Crystal: 'The company is made up of 60% men and 40% women. Ibelieve that men and women will have different levels of jobsatisfaction, and we should force our sample to have 60% men and40% women.'
Donald: 'As Bonnie says, we should put every name in a list.However, we should only pick one person at random, from the firstten people on the list, and then pick every tenth personthereafter.'
a)The member that is proposing a cluster sampleis:
1) Alvin
2) Bonnie
3) Crystal
4) Donald
b)From the list below, select the correct statementabout sampling selection methods:
1) Systematic sampling guarantees that every sample of agiven size stands an equal chance of being selected.
2) Stratified sampling guarantees that every sample of a given sizestands an equal chance of being selected.
3) Cluster sampling guarantees that every sample of a given sizestands an equal chance of being selected.
4) None of the above statements are correct.
A bank has been losing customers over the past year. Whenever acustomer closes their account with the bank, they are always askedwhy (so the bank has some idea of the services that it needs toimprove). However, it would like to gather more information on whatits current customers think, to see if there are any other areasthat it needs to work on.
The bank has 100,000 customers. Every customer name is put intoan ordered list, effectively giving each customer a number from 1to 100,000. The bank then generates 500 unique random numbersbetween 1 and 100,000 and selects the customers that correspond tothese numbers. The bank surveys these 500 customers.
This is an example of:
| systematic sampling |
| simple random sampling |
| stratified sampling |
| cluster sampling |
