Question
The population of interest to the station in the a) station's listeners. b) 3550 people who phoned in. c) area's residents. d) 781 callers favoring the tax. The station's poll is an example of a) simple random sampling. b) systematic sampling. c) convenience sampling. d) stratified sampling. In estimating the true proportion of area residents that favor the gas tax, the station's poll is likely to be a) very accurate due to the many people who phoned in. b) not very accurate due to there likely being far more area residence than the 3550 people who phoned in. c) not very accurate due to the voluntary response nature of the poll and the limited sampling frame. d) very accurate due to the large proportion of the population responding. An experiment having 3 factors with 3 levels each has potential treatments. a) 3 b) 6 c) 9 d) 27 e) none of these A study of treatments for dietary suppression looked at using Drug A alone, Drug B alone, Drugs A and B together, and a placebo. Subjects were randomly assigned to one of the four treatments. Weight loss was recorded after 6 months. Answer #12-#14 using this information. The response variable is a) the different drugs. b) the 6 months taking drug(s) d) whether subjects lost weight. The explanatory variable is a) the drug(s) taken. b) weight lost. c) whether there is a placebo effect. d) the 6 months the study ran. This is an example of a(n) a) observational study. b) completely randomized experiment. c) matched-paris experiment. d) completely randomized bock design. The design of a statistical study is if it does not systematically favor certain outcomes. a) confounded b) biased c) nonrandom d) unbiased
Explanation / Answer
Solution :
8)
Here given the 781 callers favor the tax and we are interested in favor of tax so this is sample and population is 3550 people who phoned in
so correct option is b) 3550 people who phoned in
9)
Stations poll is example of systamatic sampling because w take sample sequencially each stations .
Correct option is b) systamatic sampling.
10)
A station poll is likely to be very accurate the many people phone in . because there more people using phone .
So correct option is a) Very accurate th many people phone in.
11)
Here in thi experiements 3 factors and 3 levels so this is 3^3 factorial experiment so
here 3^3=27 teatments .
correct option is d) 27
