4.
The standard deviation (a.k.a. standard error) of
X
is:
a)
The same as the standard deviation of
X
b)
Greater than the standard deviation of
X
c)
Less than the standard deviation of
X
5.
Suppose
X
has a normal distribution. Then the distribution of
X
is:
1
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6.
A sample of 500 batteries is tested and the average lifetime of this sample is found to
be 225 hours. Based on this information, you report that the average lifetime of all
batteries of this type is 225 hours, plus or minus 50 hours. The 225 hours in this
problem represents a:
a)
Parameter
b)
Statistic
7.
If the confidence level of a confidence interval decreases, then the margin of error:
8.
Suppose you have a confidence interval for the population mean. If the sample mean
X
were to increase (and everything else stayed the same) then the margin of error for
your confidence interval would:
9.
The amount of bias in a survey is included in the margin of error of the survey.
a)
True
b) False
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 Spring '07
 rumseyjohnson
 Statistics, Normal Distribution, Standard Deviation

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