Calculating Sample Statistics

After subtracting the mean from each value in the data set, the next step is to find the sum of those differences.

• True, then square that sum.

• False. Square the differences, then find the sum.

What is the number called when you add up all of your squared difference scores?

• Squared Deviation Score

• Sum of Squares

• Degrees of Freedom

• Variance

The term for the third step in calculating variance: (X-x̄)²

• Standard deviation

• Difference score

• Squared Difference score

• Sum of Squares

A smaller, more manageable representation of a larger group

• Random Assignment

• Average

• Population

• Sample

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

The number of miles that Jenna cycled each week for a 7-week period is shown: 
36, 42, 28, 52, 48, 36, 31 
What is the median number of miles Jenna cycled?

• 24

• 36

• 39

• 52

Which of the following is a measure of variability?

• mean

• median

• mode

• standard deviation

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

Which data set has the largest standard deviation?

• Set 1

• Set 2

• Set 3

• Set 4

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

• 2

• 16

• 4