1. Question 1:
A sample of 10 unfurnished onebedroom apartments in the
north area of the city shows a sample mean rent of $540 per month.
Assume
the standard deviation is $80.
Find the 95% confidence interval for the
mean monthly rent for all unfurnished onebedroom apartments in the north
area.
A)
$540
$80
B)
$540
$50
C)
$540
$157
D)
$540
$25
Question 2:
Suppose you are comparing the south and north areas of your
city.
The south area has an average rent of $600 per month for a similar
sized apartment.
Would you conclude that the north area has a higher
average monthly rent for the same size apartment?
A) Yes
B)
No
Question 3:
Which of the following would result in an increased margin of
error?
A) Increasing the sample size.
B)
Increasing the confidence level.
C)
Using a smaller standard deviation.
D) Using a larger sample mean.
Question 4:
In order to have a margin of error equal to $40, what should the
new sample size be?
for sample sizes, you can only round up.
A) approx 4
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 Summer '07
 LIANG,FANG
 Statistics, Normal Distribution, Standard Deviation

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