Question

23-30. Survey details. For the following reports about statistical studies, identify the following items (if possible). Ifyou can't tell then say so-this often happens when we read about a survey a) The population b) The population parameter of interest c) The sampling frame d) The sample e) The sampling method, including whether or not ran- domization was employed f) Any potential sources of bias you can detect and any prob- you see in generalizing to the population of interest

Answer 1

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a. Population: All the US adults aged 18 and older during the period 7-10th of March, 2013
b. Population parameter of interest: Proportion of target population who agreed that the global warming is due to human activities.
c. Sampling frame: It is a collection of all the US adults aged 18 and older during the period 7-10th of March, 2013
d. Sample: Sub collection of 1022 randomly selected from the sampling frame.
e. Sampling Method: Yes, It is a randomly selected sample of 1022 respondents that represents the target population.
f. Bias: Since it is all the adults aged 18 and older that includes all the people irrespective of their awareness of the global warming, There are chances of no response from the people selected randomly, some may not be interested in the topic of discussion, few will just ignore the survey without giving proper answers.
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a. Population: All the people who come out of a bar
b. Population parameter of interest: Proportion of target population who agreed that the drinking and driving is a serious problem.
c. Sampling frame: It is a collection of all the people who comes out from a bar.
d. Sample: Sub collection of 1 in every 10 randomly selected people who comes out from the bar.
e. Sampling Method: Yes, It is a randomly selected stratified sample of 1 and 10 bar goers.
f. Bias: There are few people who comes out from bars are not drinkers. And getting response from a drunk men or women will not always be the best reponse. And Most of the over drunk men or women's reply will be under the influence of the alcohol, not a well thought out ones.