Quiz (WK3)
1.
All possible samples of size n are selected from a population and the mean of
each sample is determined. What is the mean of the sample means?
(Points : 1)
Exactly the same as the population mean
Larger than the population mean
Smaller than the population mean
Cannot be estimated in advance
2.
When dividing a population into subgroups so that a random sample from each
subgroup can be collected, what type of sampling is used?
(Points : 1)
simple random sampling
systematic sampling
stratified random sampling
cluster sampling
3.
An accounting firm is planning for the next tax preparation season. From last
year's returns, the firm collects a systematic random sample of 100 filings. The
100 filings showed an average preparation time of 90 minutes with a standard
deviation of 140 minutes. What is the standard error of the mean?
(Points : 1)
14 minutes
140 minutes
1.4 minutes
90 minutes
4.
Manufacturers were subdivided into groups by volume of sales. Those with more
than $100 million in sales were classified as Class A large; those from $50 to
$100 million as Class A medium size; and those between $25 and $50 million, and
so on. Samples were then selected from each of these groups. What is this type of
sampling called?
(Points : 1)
Simple random
Stratified random
Cluster
Systematic
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A group of statistics students decided to conduct a survey at their university to
find the average (mean) amount of time students spend studying per week.
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 Fall '10
 RandallBarcus
 Normal Distribution, Standard Deviation, class a

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