What is the sample standard deviation of the following data set?x = { 41, 42, 45, 47, 48, 50, 51, 53, 57, 58, 59, 61, 62, 64, 67, 69 }Round your answer to the nearest hundredths place (X.X format).
Question
What is the sample standard deviation of the following data set?
x = { 41, 42, 45, 47, 48, 50, 51, 53, 57, 58, 59, 61, 62, 64, 67, 69 }
Round your answer to the nearest hundredths place (X.X format).
Solution
To calculate the sample standard deviation, follow these steps:
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Calculate the mean (average) of the data set. Add all the numbers together and divide by the number of data points.
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Subtract the mean from each data point to get the deviation of each point.
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Square each deviation.
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Add up all the squared deviations.
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Divide the sum of the squared deviations by the number of data points minus 1 (this is what makes it the sample standard deviation rather than the population standard deviation).
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Take the square root of the result from step 5. This is the sample standard deviation.
Let's do the calculation:
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Mean: (41+42+45+47+48+50+51+53+57+58+59+61+62+64+67+69) / 16 = 54.25
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Deviations: -13.25, -12.25, -9.25, -7.25, -6.25, -4.25, -3.25, -1.25, 2.75, 3.75, 4.75, 6.75, 7.75, 9.75, 12.75, 14.75
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Squared deviations: 175.5625, 150.0625, 85.5625, 52.5625, 39.0625, 18.0625, 10.5625, 1.5625, 7.5625, 14.0625, 22.5625, 45.5625, 60.0625, 95.0625, 162.5625, 217.5625
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Sum of squared deviations: 1050.25
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Divide by n-1: 1050.25 / 15 = 70.01666666666667
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Square root: √70.01666666666667 = 8.37 (rounded to the nearest hundredths place)
So, the sample standard deviation of the data set is 8.37.
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