Standard Deviation Measures of Spread

Which of the following is a measure of variability (spread)?

• mean
• median
• mode
• standard deviation

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

• 2
• 16
• 4

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.

What does this symbol represent?

• Standard Deviation of sample

• Variance

• Mean Absolute Deviation

• standard deviation of population

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

• 8

• 4096

• 0

• 6.8

All of the below sets have the same mean.

Set I- Standard Deviation=3.1

Set II- Standard Deviation=4.9

Set III- Standard Deviation=1.7

Set IV- Standard Deviation=3.2

Which set of data probably has the points closest to the mean?

• I

• II

• III

• IV

What is the range of this data set?

• 20
• 5
• 30
• 26

Order the dot plots from least to greatest standard deviation.

• A, D, C, B

• B, C, D, A

• A, D, B, C

• B, C, A, D

What is the standard deviation for the data given:

{12, 12, 12, 12}

• 12

• 0

• 3

• 9