22) Nationalities of survey respondents 23) Thirty-five sophomores, 35juniorsand
ID: 3202962 • Letter: 2
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22) Nationalities of survey respondents 23) Thirty-five sophomores, 35juniorsand 49 seniors are randomly selected from 230 sophomores, 280 juniors and 577 seniors at a certain high school. What sampling technique is used? 240 Every fifth teenager nering a concert dhecked for possession of drugs what sampling technique is used? 25 Ata local community collese, five statistics dasses are randomly selected and all of the students from each class are interviewed. What sampling technique is used? A convenience B) systematic 26) A researcher randomly selects and interviews fifty male and fifty female teachers What sampling technique is E) stratified 27 A researcher for an airline interviews all of the passengers on five randomly selected flights. What sampling technique is used? Bo convenience C) stratified systematic A) random 28 A community college student interviews everyone in a statistics class to determine who owns a car. What sampling technique is used? random C) convenience D) stratified Useldentify the statistical abuse for each 29) A company accused of downsizing workers defended itself with the following statement "Yes, we were forced to lay off 20% of our workforce last year, but this year we increased our workforce by 20% and we therefore now have the same number ofemployees as before the layoff. What is the flaw in this argument? 30) You plan to make a survey of 200 people. The plan is to talk to every 10th person coming out of the school library. Is there a problem with your plan? 317out of 10 dentists recommend Brand Xtoothpaste". This finding is based on the results of a survey of 10 randomly selected dentists. What is wrong with this survey?Explanation / Answer
22. C) Nominal
(The attribute Nationality has only names[ Nominal] , This can not be ordered[×Ordinal], Distance is not meaningful[×Interval], Zero not included[×Ratio])
23. E) Stratified
(In Stratified sampling, the groups(strata) are formed according to some rules. Then from each strata, samples are selected at random with equal or unequal sample size.)
24. A) Systematic
(In systematic sampling, the units are selected at fixed periodic interval from the first random starting point)
25. D) Cluster
(In cluster sampling, population is divided into groups(clusters), One or more clusters are selected at random and all units in the selected cluster are surveyed.)
26. E) Stratified
(In Stratified sampling, the groups(strata) are formed according to some rules. Then from each strata, samples are selected at random with equal or unequal sample size.)
27. D) Cluster
(In cluster sampling, population is divided into groups(clusters), One or more clusters are selected at random and all units in the selected cluster are surveyed.)
28. C) Convenience
(Convenience sampling is non probability sampling in which randomness is not included i.e. easily available samples are surveyed. In this example, the class is selected as per convenience i.e. not randomly selected. Therefore, this is a convenience sampling)
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