U1-4

Question 1

Position Percentiles

Answer 1

Split the data into 2 (where k is any number 1-100), the lower piece contains k% of the data.

Question 2

Interquartile Range

Answer 2

Range of the middle 50% of the scores in a distribution.

Question 3

Variability

Answer 3

The spread of a group of scores.

Question 4

Variance

Answer 4

Average squared difference of the scores from the mean.

Question 5

Standard Deviation

Answer 5

Square root of variance.