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Multiple Choice Quiz
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1
A good sample is one in which there is no bias from the sampling process. This is defined as
A)Consistency
B)Accuracy
C)Precision
D)Reliability
2
Which of the following represents an unrestricted method of sample element selection?
A)Systematic random sample
B)Cluster random sample
C)Simple random sample
D)Quota sample
3
The size of the interval estimate is measured in terms of which of the following measures of dispersion?
A)Standard deviation of the sample
B)Variance of the sample
C)Standard error of the sample mean or percentage
D)Coefficient of variation of the sample
4
Which of the following is an inappropriate reason to use a sampling procedure rather than a population study?
A)Sampling in some cases gives statistical efficiency at a low cost.
B)It gives the possibility of interviewing respondents better, and improving investigation.
C)It is necessary when subjects are very diverse from one another.
D)Often error is from non-sampling rather than sampling sources.
5
Probability sampling implies
A)All elements have an equal chance of selection.
B)The selected sample elements have an equal chance of selection, with respect to one another.
C)All elements of the population have a known probability of selection
D)It is restricted since the probability of selection is restricted to less than one.
6
The sampling frame
A)Should be a listing of the population itself.
B)Is always prepared on random selection basis.
C)Details the sample selection procedure.
D)Is the list of items selected in the sample.
7
The standard error of the mean is
A)The average of the sample means
B)The standard deviation of the distribution of sample means
C)The average difference between the sample means and the population mean
D)None of the above.
8
Which of the following statements regarding systematic sampling is incorrect?
A)Is generally treated as equivalent to simple random sampling.
B)Chooses k elements, each with the same selection probability of less than one.
C)Chooses the first of k elements at random, and then every kth element.
D)Can give economic and statistical efficiency.
9
A stratified sample is of greatest statistical efficiency when
A)The variances within strata are large.
B)The variances within strata are small.
C)The sample is a significant portion of the population.
D)The sample is large.
10
Suppose you wish to study consumption of coffee among 10,000 families and conclude you should use a clustering method with clusters of 8 families each. You study several such clusters and find that the standard deviation of the cluster means is 3 lbs. per year. Suppose you want to estimate population consumption within a plus or minus .4 lbs. at a two sigma level of confidence. Which of the following numbers is closest to the number of clusters you should use?
A)10
B)20
C)60
D)230





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