Standard Deviation and Variance Review

Before you can begin calculating the variance, you must first:

• find the mean

• find the median

• find the mode

• find the range

What does variance represent?

• How many different variations are in the data set.

• How the population varies compared to the sample.

• How spread out each data value is from the mean.

• The range, but with a bunch of other stuff going on.

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CCSS.HSS.ID.A.2

CCSS.HSS.ID.A.3

How do you calculate the standard deviation?

• Divide the variance by 2.

• Its a long process and I can't explain it right now.

• Find the mean and multiply it by the variance.

• Take the square root of the variance.

If the standard deviation of a data set is 4, what is the variance?

• 2
• 16
• 4

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

• 511.33

• 22.61

• 438.48

• 20.94

Find the mean of the given data 8, 7, 5, 9, 6, 13

• 8
• 7.5
• 7.5
• 10

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CCSS.6.SP.A.2

CCSS.6.SP.A.3

CCSS.6.SP.B.5

How do you calculate the standard deviation?

• Divide the variance by 2.

• Its a long process and I can't explain it right now.

• Find the mean and multiply it by the variance.

• Take the square root of the variance.

What does this symbol represent?

• Standard Deviation
• Variance
• Mean Absolute Deviation
• Sigma

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CCSS.HSS.ID.A.2

CCSS.HSS.ID.A.4

Given a variance of 64, what is the standard deviation?

• 8

• 4096

• 0

• 6.8

Four data sets are shown below.
Set 1: {10, 19, 38, 50, 51}
Set 2: {5, 21, 26, 39, 51}
Set 3: {9, 38, 50, 50, 51}
Set 4: {5, 28, 28, 28, 51}
Which data set has the largest standard deviation?

• Set 1
• Set 2
• Set 3
• Set 4

Tags

CCSS.HSS.ID.A.2