Analysing Data (Junior Cert Mathematics): Quizzes

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Measures of Spread
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What does the range measure in a data set?

Difference between largest & smallest

How do you calculate the range?

Highest number minus lowest number

Find the range of: 4,9,2,11,64, 9, 2, 11, 6

99

What is an advantage of using the range?

Easy to calculate

What is a disadvantage of the range?

Sensitive to outliers

What does the IQR measure?

Spread of the middle half of data

What percentage of data does the IQR focus on?

Middle 50%

What is Q1Q1 (the first quartile)?

Median of the lower half

What is Q3Q3 (the third quartile)?

Median of the upper half

If Q1=7Q1 = 7 and Q3=18Q3 = 18, what is the IQR?

1111

Why is the IQR better than range when there are outliers?

It isn't affected by extreme values

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