Which sampling method will result in a sample that is not biased
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Which sampling method will result in a sample that is not biased

[From: ] [author: ] [Date: 12-05-09] [Hit: ]
(2ND CHOICE) - The sample will only consist of employees who go to the break room and isnt proportional to the entire population.(3RD CHOICE) - The sample will only reflect a groups of employees who are CURRENTLY using the program and isnt proportional to the entire population.(4TH CHOICE) - This sample will only reflect half the group of employees who go to the caffeteria at a certain time of day which isnt proportional to the entire population.-Simple Random Sampling Method.......
A newly hired IT specialist for a company wants to know about how many of the employees are running outdated versions of a program. Which sampling method will result in a sample that is not biased?

He lists the office phone numbers of every employee and programs his computer to randomly select 50 of those numbers.

He puts notices in the break rooms asking employees to e-mail him the version they are running.

He walks around and checks the version when he sees an employee using the program.

He asks every other employee he sees in the cafeteria about his or her program.

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YOUR ANSWER IS:
(1ST CHOICE) He lists the office phone numbers of every employee and programs his computer to randomly select 50 of those numbers.
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THE BIAS FOR THE OTHERS ARE

(2ND CHOICE) - The sample will only consist of employees who go to the break room and isn't proportional to the entire population.

(3RD CHOICE) - The sample will only reflect a groups of employees who are CURRENTLY using the program and isn't proportional to the entire population.

(4TH CHOICE) - This sample will only reflect half the group of employees who go to the caffeteria at a certain time of day which isn't proportional to the entire population.

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Simple Random Sampling Method.
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