Measures of Variation (2.4)

This is used to describe the distribution of the data

• outlier

• range

• measures of variation

• quartile

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Which club has the smaller spread?

• Cruisers

• Car Hops

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When calculating the range of a data set, I need to

• subtract minimum - maximum

• subtract maximum - minimum

• subtract Q₁ - Q₃

• subtract Q₃ - Q₁

• use the 1.5 ( IQR ) rule

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Roger bowled 7 games last weekend. His scores are: 155, 165, 138, 172, 127, 193, 142. What is the range of Roger's scores?

• 193
• 127
• 60
• 66

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Find the range.
12, 5, 9, 18, 22, 25, 5

• 20
• 15
• 22
• 18

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What is an advantage of using the range as a measure of​ variation?

• It uses only two entries from the data set.

• It uses all entries from the data set.

• It is easy to compute.

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What is a disadvantage of using the range as a measure of​ variation?

• It is hard to compute.

• It uses all entries from the data set.

• It uses only two entries from the data set.

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What does the value N​ mean?

• The mean of the population data.

• The difference between all the values in the population data set.

• The number of values in the population data set.

• The range of the population data.

 Find the sample standard deviation.
2  6  15  9  11  22  

• 49.37

• 7.03

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What is the standard deviation for the data set given below? Data comes from a population.
{ 5, 10, 7, 12, 0, 20, 15, 22, 8, 2 }

• 6.89
• 10.1
• 7.26
• 9

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