For the following report about a statistical study, identify the items below: to

Question

For the following report about a statistical study, identify the items below: to find the public's views on obesity, researchers waited outside a fast food restaurant they had randomly selected from a list of such establishments. they stopped every 25th person who came out of the restaurant and asked whether he or she thought obesity was a serious problem.

a The population:

A.all people except those who work at fast food restaurantfast food restaurants

B.people

C.every 25th person leaving the restaurant

D.all people that go to fast food restaurantfast food restaurants

b) The population parameter of interest:

A.proportion who think obesity is not a serious problem

B.proportion of people who think obesity is a serious problem

C.proportion of people who answered the survey

D.proportion of people who did not answer the survey

c) The sampling frame:

A. all people except those who work at fast food restaurantfast food restaurants

B.people who think obesity is a problem

C.every 25th person leaving the restaurant

D.restaurant customers

d) The sample:

A.people

B.every person leaving the restaurant

C.every 25th person leaving the restaurant

D.all people except those who work at fast food restaurantfast food restaurants

e) The sampling method, including whether or not randomization was employed:

A.questionnaire (non-random)

B.not specified, non-random

C.not specified, but at least "random"

D.systematic sampling

f) Any potential sources of bias you can detect and any problems you see in generalizing to the population of interest:

A.Response bias is possible. The study is conducted in such a way as to achieve a desired response that may be different from the population in general.

B.Nonresponse bias is possible. Since some people leaving the restaurant may not respond to theinterview, the study may misrepresent the general population.

C.Undercoverage bias is possible. Since those interviewed just left a fast food restaurant commafast food restaurant, their opinions about obesity may differ from the population in general.

D.There is no indication of bias.

Explanation / Answer

a. The population:

D.all people that go to fast food restaurantfast food restaurants

b) The population parameter of interest:

B.proportion of people who think obesity is a serious problem

c. The sampling frame

D.restaurant customers

d) The sample:

C.every 25th person leaving the restaurant

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