Standard Deviation and Variance Review

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

• 2

• 16

• 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

What does this symbol represent?

• Standard Deviation

• Variance

• Mean Absolute Deviation

• Sigma

List each set of data by color from the lowest standard deviation to the highest standard deviation.

• blue, green, pink, red

• red, pink, green, blue

• pink, green, red, blue

• blue, green, red, pink

What is the standard deviation on this Normal Curve?

• 6

• 12

• 34

• 18

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

• find the mean

• find the median

• find the mode

• find the range

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.

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

All of the below sets have the same mean.
Set 1-Standard Deviation=3.1
Set 2-Standard Deviation=4.9
Set 3-Standard Deviation=1.7
Set 4-Standard Deviation=3.2
Which set of data probably has the points closest to the mean?

• 1

• 2

• 3

• 4