Chapter 1. Normal Distributions

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Stat Tutor
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Question 1

1:02

Question 1.1

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Incorrect. Normal density curves model many bell-shaped distributions.
Correct. Normal density curves model many bell-shaped distributions.
Incorrect. Try again.
2

Question 2

1:18

Question 1.2

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Incorrect. A Normal distribution is single peaked.
Correct. A Normal distribution is single peaked.
Incorrect. Try again.
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Questions 3-8

2:49

Question 1.3

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Incorrect. This is a correct statement.
Correct. This is a correct statement.
Incorrect. Try again.
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Question 1.4

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Incorrect. Standard deviation equals the distance from the mean to the point where the curve begins to fall less steeply.
Correct. Standard deviation equals the distance from the mean to the point where the curve begins to fall less steeply.
Incorrect. Try again.
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Question 1.5

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Incorrect. There are three arrows on either side of the mean. Each arrow has length equal to σ (standard deviation).
Correct. There are three arrows on either side of the mean. Each arrow has length equal to σ (standard deviation).
Incorrect. Try again.
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Question 1.6

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Incorrect. µ and σ characterize a Normal distribution.
Correct. µ and σ characterize a Normal distribution.
Incorrect. Try again.
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Question 1.7

Normal Curve Image
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Incorrect. The value on the x-axis directly below the highest peak of the curve in the center is 60.
Correct. The value on the x-axis directly below the highest peak of the curve in the center is 60.
Incorrect. Try again.
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Question 1.8

Normal Curve Image
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Incorrect. Since there are three standard deviation lengths on either side of the mean, standard deviation equals 5 for this Normal curve. Another way to find this is to first compute range and then divide range by 6. For this Normal curve, range = 75 - 45 = 30 and 30/6 = 5.
Correct. Since there are three standard deviation lengths on either side of the mean, standard deviation equals 5 for this Normal curve. Another way to find this is to first compute range and then divide range by 6. For this Normal curve, range = 75 - 45 = 30 and 30/6 = 5.
Incorrect. Try again.
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Applet

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