Chapter 1. Finding Normal Proportions

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Stat Tutor
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Question 1

0:36

Question 1.1

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Incorrect. We use either the Standard Normal table or statistical software to find areas for a Normal distribution.
Correct. We use either the Standard Normal table or statistical software to find areas for a Normal distribution.
Incorrect. Try again.
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Questions 2-3

1:40

Question 1.2

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Incorrect. A cumulative proportion is the area to the left.
Correct. A cumulative proportion is the area to the left.
Incorrect. Try again.
2

Question 1.3

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Incorrect. Since the Standard Normal table gives cumulative proportions, we need to match the area we want with a cumulative proportion.
Correct. Since the Standard Normal table gives cumulative proportions, we need to match the area we want with a cumulative proportion.
Incorrect. Try again.
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Question 4

3:05

Question 1.4

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Incorrect. A cumulative proportion gives area on the left. To find area on the right, we subtract the cumulative area from 1.0.
Correct. A cumulative proportion gives area on the left. To find area on the right, we subtract the cumulative area from 1.0.
Incorrect. Try again.
2

Question 5

4:38

Question 1.5

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Incorrect. Since the Standard Normal table gives cumulative areas for z-scores, we must first find the z-score corresponding to the x-value.
Correct. Since the Standard Normal table gives cumulative areas for z-scores, we must first find the z-score corresponding to the x-value.
Incorrect. Try again.
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