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1
A sample is best characterized as
A)A part of the population.
B)Having more than 30 observations.
C)Being identified as N.
D)Being identified as σ.
2
Sampling is often preferred to surveying a population because
A)Surveying a population can be very expensive.
B)It can be physically impossible to find all the items in the population.
C)Sample results can be very accurate.
D)All of the above are reasons for sampling.
3
Which of the following is a method of probability sampling?
A)Random sampling
B)Systematic sampling
C)Stratified sampling
D)All of the above are methods of probability sampling.
4
In a simple random sample
A)Every kth item is selected to be in the sample.
B)Every item has a chance to be in the sample.
C)Every item has the same chance to be in the sample.
D)Only 10 items are selected.
5
Suppose a population consisted of 20 items. How many different samples of n = 3 are possible?
A)6840
B)1140
C)20
D)120
6
The difference between the sample mean and the population mean is called the
A)Population mean.
B)Population standard deviation.
C)Standard error of the mean.
D)Sampling error.
7
The mean of the all possible sample means and the population mean will always be
A)Equal.
B)Normally distributed.
C)Characterized by the standard error of the mean.
D)Different.
8
When the variances of the population distribution and the sampling distribution of means are compared, the
A)Variances are equal.
B)Population variance is smaller than the sampling distribution variance.
C)Population variance is larger than the sampling distribution variance.
D)Variances have the same degrees of freedom.
9
Suppose a population does not follow the normal distribution. If we select a sample from the population, how large should the minimum sample size be so that the sampling distribution approximates the normal distribution?
A)2
B)5
C)20
D)30.
10
The standard error of the mean is
A)The standard deviation of the sampling distribution of sample means.
B)Always normally distributed.
C)Sometimes less than 0.
D)Is the variance squared.





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