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

@kirbykirby answere please

Answer 2

Almost any non-probabilistic method of sampling will result in a biased sample. For example, you could ask people if they want to volunteer their time to fill out the survey, until you reach the cap of 10% (so like 80 employees).

An even worse method would be to sample only a certain group of individuals (like only ask people with executive positions and ignore everyone else).

Answer 3

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 would lead to a representative sample for the survey. Explain why it would be a good choice and give details about the process

Answer 4

@kirbykirby

Answer 5

One way you could do this is to allocate 10% to each employee category...
So selecting 10% of 100 executives = 10
10% of 650 middle management = 65
10% of 50 custodial positions = 5

So you still end up with a total of 80 for your sample, which is 10% of 800

Answer 6

A neurobiologist is launching a nationwide professional study on the connection between text messaging and a particular type of brain function. The population of his study is twelve- to thirty-two-year-old people who text at least once a day. He wants to make sure that the whole range of ages is represented in the study. Which kind of sampling would provide the most reliable information for this study?

convenience sampling

simple random sampling

systematic sampling

volunteer sampling

Answer 7

@kirbykirby

Answer 8

I would go with systematic sampling in this case, since you'll be able to go over all age ranges (which wouldn't necessarily be guaranteed for simple random sampling). Convenience and volunteer sampling shouldn't be used whenever you can since they are not probabilistic methods of sampling.

Answer 9

ok thx that really helps alot:)

Answer 10

yw :)