2.7 Measure of Spread

Question 1

Measure of Variation

Answer 1

the variability in a distribution can be measured by the horizontal spread

Question 2

Standard Deviation

Answer 2

a number that measures how far away the typical observation is from the mean, the square root of the variance

Question 3

Variance

Answer 3

the average of the squares of the distance each value is from the mean

Question 4

z-score

Answer 4

measuring a data value relative to the sample it’s in units of standard deviation rather than with respect to the original units

Question 5

z score formula

Answer 5

x-x^-/s