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Stat 4714 Sample Questions for Exam 3  Solutions
1)
What would be the correct conclusion if we failed to reject the null hypothesis for
H
0
:
= 5 and H
1
:
> 5
with xbar= 6.2?
a.
There is not enough evidence to show that the true population mean equals 5.
b.
There is not enough evidence to show that the true population mean is greater than 5.
c.
There is enough evidence to show that the true population mean is 6.2.
d.
No conclusion can be drawn.
2)
A twotailed pvalue for a test on a population mean given sigma is .03. What would the onetailed pvalue be?
a. .03
b. .015
c. .06
d. None of the above
3) The diameter of a spindle in a small motor is supposed to be 5 mm. If the spindle is either too small or too large, the motor will not
work properly. The manufacturer measures the diameter in a sample of motors to determine whether the mean diameter has moved
away from the target. What are the null and alternative hypotheses?
a.H
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This note was uploaded on 01/17/2011 for the course STAT 4714 at Virginia Tech.
 '07
 MQLemons

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