Question

5.A survey of 15 randomly selected employees from Bob’s factory was taken to find out how many sick days they took due to colds and flu last year. Suppose Bob didn’t take a random sample. Suppose the employees in the sample were those who responded to an advertisement Bob put out to the whole company, looking for volunteers to participate in the survey. What kind of error would be made here? THERE IS ONLY ONE CORRECT ANSWER – CHECK YOUR LECTURE NOTES.

a.Undercoverage

b.Nonresponse

c.Bias due to a self-selected sample

d.None of the above

6.A statistics student wants to know what OSU students think about parking on campus. To obtain a sample of 20 students, he knocks on the doors of residents in his dorm until he finds 20 people home who can take his survey about parking. This is a:

a.Simple random sample

b.Stratified sample

c.Convenience sample

Answer 1

5.A survey of 15 randomly selected employees from Bob’s factory was taken to find out how many sick days they took due to colds and flu last year. Suppose Bob didn’t take a random sample. Suppose the employees in the sample were those who responded to an advertisement Bob put out to the whole company, looking for volunteers to participate in the survey. What kind of error would be made here? THERE IS ONLY ONE CORRECT ANSWER – CHECK YOUR LECTURE NOTES.

a.Undercoverage

b.Nonresponse

Answer: c.Bias due to a self-selected sample

d.None of the above

Note: Voluntary response bias occurs when sample members are self-selected volunteers, as in voluntary samples .

6.A statistics student wants to know what OSU students think about parking on campus. To obtain a sample of 20 students, he knocks on the doors of residents in his dorm until he finds 20 people home who can take his survey about parking. This is a:

a.Simple random sample

b.Stratified sample

Answer: c.Convenience sample

Note: A convenience sample is made up of people who are easy to reach. Here the student selects residents nearby to his/her convenience.