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Practice Quiz
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1
A sample
A)Is a part of the population.
B)has more than 30 observations.
C)is usually identified as N.
D)All of the above.
2
Which of the following is a reason for sampling?
A)The destructive nature of certain tests.
B)The physical impossibility of checking all the items in the population.
C)The adequacy of sample results.
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)All of the above.
5
Suppose a population consisted of 20 items. How many different samples of size 3 are possible?
A)6,840
B)1,140
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 all possible sample means and the population mean will
A)Always be equal.
B)Always be normally distributed.
C)Be characterized by the standard error of the mean.
D)None of the above.
8
Suppose we have a population that follows the normal distribution. Which of the following statements is correct regarding the distribution of sample means?
A)The population standard deviation is always unknown.
B)The distribution of the sample means will also follow the normal distribution.
C)The distribution of the sample means will also follow the normal distribution.
D)None of the above is correct.
9
Suppose we have a population that does not follow the normal distribution. If we select sample of what size will the distribution approximate 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)None of the above.
11
The mean amount paid for a two-bedroom apartment in Calgary is $950 per month. The distribution of amounts paid follows the normal distribution with a standard deviation of $180 per month. What is the probability of selecting a sample of 40 apartments and finding the mean of the sample to be more than $1,000?
A).3897
B).4608
C).0392
D)None of the above.
12
The mean salary of bank tellers is $48,000 with a standard deviation of $7,200. What is the probability of selecting a random sample of 36 tellers with a sample mean less than $46,800?
A).6587
B).3413
C).0675
D).9325
13
A suburban high-rise development consists of twelve towers of condominiums. One of them is chosen at random and the residents invited to give their opinions on the groundskeeping. This is an example of a
A)Cluster sample
B)Stratified sample
C)Simple random sample
D)Systematic random sample
14
The mean fill from a bottling machine is supposed to be 450 ml with a standard deviation of 2 ml. What is the probability that the mean fill of a sample of 16 would be less than 449 ml if the machine is operating correctly?
A).0228
B).4772
C).1915
D).3085





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