Mad Variance and Standard Deviation

If the standard deviation of a data set is 10, what is the variance?

• 20

• 100

• 2.5

• 10

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

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

• 511.33

• 22.61

• 438.29

• 20.94

The number of goals scored by seven forwards in one soccer season were 8, 6, 4, 8, 3, 1, and 5. Find the mean absolute deviation (MAD) of goals scored by the seven forward.

• 2

• 10

• 3

• 5

What does this symbol represent?

• Standard Deviation

• Variance

• Mean Absolute Deviation

• Sigma

What does this symbol represent?

• Standard Deviation

• Variance

• Mean Absolute Deviation

• Sigma

What does this symbol represent?

• Variance

• Standard Deviation

• Mean Absolute Deviation

• Sigma

What is the standard deviation on this Normal Curve?

• 6

• 12

• 34

• 18

What is the difference between the formulas for population variance and sample variance?

• The sample variance is the square root of the population variance.

• The population variance divides the sum of the squares by n-1, while sample divides by N.

• The population variance divides the sum of the squares by N, while sample divides by n-1.

• There is no difference.

What is the sample standard deviation for the data given:

5, 10, 7, 12, 0, 20, 15, 22, 8, 2. Round the mean to whole number.

• 6.89

• 10.1

• 7.26

• 9