iQ4 A A sample of size three is selected at random from all

iQ4

A) A sample of size three is selected at random from all the possible samples of three employees from the company?s workforce.

Possible answers: (Cluster sampling, Systematic random sampling, Simplerandom sampling, Stratified sampling or quota sampling)

B) A researcher selects from the company?s workforce the first four male employees and the first three female employees that he comes across to be in the sample.

Possible answers: (Cluster sampling, Systematic random sampling, Simplerandom sampling, Stratified sampling or quota sampling)

C) Two of the locations at which employees are based are chosen at random. Half of the employees based at either of these two locations, chosen at random, are then selected to be in the sample.

Possible answers: (Cluster sampling, Systematic random sampling, Simplerandom sampling, Stratified sampling or quota sampling)

A company decides that it wants to discover its employees\' attitudes towards a proposed rebranding by surveying a sample of them. The company employs 100 people, spread over 5 locations. Labels from 1 to 100 are used to label these employees. (Each employee is based at one, and only one, of these 5 locations. The labels are assigned to the people in no particular order.) The company believes that an employee\'s attitudes depend on the age and gender of the employee but not where the employee lives or works. Below are three descriptions of ways of choosing the sample. Which type of sampling does each correspond to?

Solution

A. Stratified Sampling. The company employees are divided into 5 strata and then a simple random sample is drawn from each group. Hence, this is stratified sampling.

B. Quota Sampling. A proportion is pre decided. And then desired number of male & female employees is selectedd. Hence, this is quota sampling.

C. Cluster sampling. Two of the 5 loctions are selected, and then a random subset is selected from these 2 clusters. This is two-stage cluster sampling.