To find the variance and standard deviation for the two distributions
An animal trainer obtained the following data (Table A) in a study of reaction times of dogs (in seconds) to a specific stimulus. He then selected another group of dogs (Table B) that were much older than the first group and measure their reaction times to the same stimulus.
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Table A
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Table B
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Classes
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Frequency
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Classes
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Frequency
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2.3-2.9
|
10
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2.3-2.9
|
1
|
|
3.0-3.6
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12
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3.0-3.6
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3
|
|
3.7-4.3
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6
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3.7-4.3
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4
|
|
4.4-5.0
|
8
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4.4-5.0
|
16
|
|
5.1-5.7
|
4
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5.1-5.7
|
14
|
|
5.8-6.4
|
4
|
5.8-6.4
|
4
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Find the variance and standard deviation for the two distributions above. Compare the variation of the data sets. Decide if one data set is more variable than the other.