Question

The owner of a large company is conducting a survey about job satisfaction, including questions about salary, hours, stress, and other conditions. There are about eight hundred employees in the company, including one hundred executive positions, six hundred fifty middle-management positions, and fifty custodial positions. The owner wants to include about ten percent of his employees in the survey sample.

Identify a sampling method that might produce a biased sample. Explain why using the method for this survey would be a poor choice.

Answer 1

biased sample ( 10% of the survey from his employees )

Answer 2

One way of minimising bias in the sample is to select about 80 people at random from a list of the eight hundred employees. One way of doing this is to use special tables of random numbers.
Would selecting the sample of employees in a way that was not random be a good idea?