1.
Question:
(TCO 6) In the standard normal distribution, the standard deviation is always
Your Answer:
0
1
( Ch 5: By definition, the standard
deviation = 1. )
CORREC
T
2
none of
these
Points
Received:
5 of 5
2.
Question:
(TCO 6) The area under a normal curve with mu = 15 and sigma = 2 is
Your Answer:
0
1
( Ch 5: The total area under ANY normal
probability distribution is always 1. )
CORREC
T
2
none of
these
Points
Received:
5 of 5
3.
Question:
(TCO 6) If John gets an 80 on a physics test where the mean is 85 and the
standard deviation is 3, where does he stand in relation to his classmates?
Your Answer:
He is in the
top 5%.
He is in the
top 10%.
He is in the
bottom 5%.
( Ch 5: z = (80 – 85)/3 = 1.67. Area to
the left is 0.0475. Thus, 4.75% of test
scores are below 80. )
CORREC
T
He is the
bottom 1%.
Points
Received:
5 of 5
4.
Question:
(TCO 6) In a normal distribution with mu = 25 and sigma = 3, what number
corresponds to z = 3?
Your Answer:
16
( Ch 5: x = mu + z * sigma, so x =
16 )
CORREC
T
18
20
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none of these
Points
Received:
5 of 5
5.
Question:
(TCO 6) Let’s assume you have taken 100 samples of size 36 each from a
normally distributed population. Calculate the standard deviation of the
sample means if the population’s variance is 25.
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 Summer '11
 Lipper
 Normal Distribution, Standard Deviation

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