Chapter 1. Measuring spread: the quartiles

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Questions 1-2

1:01

Question 1.1

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Incorrect. Quartiles split the ordered data into four approximately equally sized data sets.
Correct. Quartiles split the ordered data into four approximately equally sized data sets.
Incorrect. Try again.
2

Question 1.2

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Incorrect. Since the second quartile splits the data in half, it is the median.
Correct. Since the second quartile splits the data in half, it is the median.
Incorrect. Try again.
2

Questions 3-5

2:33

Question 1.3

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Incorrect. The middle observation is not the median unless the data have already been ordered.
Correct. The middle observation is not the median unless the data have already been ordered.
Incorrect. Try again.
2

Question 1.4

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Incorrect. Since the portion of the data used to find Q1 has to be the same size as the portion of data used to find Q3, we leave out the middle observation.
Correct. Since the portion of the data used to find Q1 has to be the same size as the portion of data used to find Q3, we leave out the middle observation.
Incorrect. Try again.
2

Question 1.5

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Incorrect. Since Q1 splits the lower half of the data in half, it is the median of the lower half of the data.
Correct. Since Q1 splits the lower half of the data in half, it is the median of the lower half of the data.
Incorrect. Try again.
2

Questions 6-7

3:52

Question 1.6

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Incorrect. Since the median is not one of the data values, we don't need to do anything with it to get the portion of the data used to find Q1 to be the same size as the portion of data used to find Q3.
Correct. Since the median is not one of the data values, we don't need to do anything with it to get the portion of the data used to find Q1 to be the same size as the portion of data used to find Q3.
Incorrect. Try again.
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Question 1.7

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Incorrect. Since Q3 splits the upper half of the data in half, it is the median of the upper half of the data.
Correct. Since Q3 splits the upper half of the data in half, it is the median of the upper half of the data.
Incorrect. Try again.
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