1.4 Measures of Dispersion for Sample Data

Question 1

What does sample variance use as a point of reference?

Answer 1

The sample mean

Question 2

By definition, the sample variance is ______________.

Answer 2

non-negative

Question 3

What is the unit of sample variance?

Answer 3

Expressed in squared units

Question 4

What is the unit of the standard deviation?

Answer 4

Expressed in the same unit as the sample mean and the random variable

Question 5

What does the coefficient of variation allow?

Answer 5

To compare samples of data collected for two random variables expressed in different units or samples of data with very different means

Question 6

What is the unit of the coefficient of variation?

Answer 6

Unitless

Question 7

Which measure of dispersion is expressed in squared units?

Answer 7

Sample variance

Question 8

Which measure of dispersion is expressed in the same unit as the random variable?

Answer 8

Standard deviation

Question 9

Which measure of dispersion is unitless?

Answer 9

Coefficient of variation

Question 10

What is the equation for sample variance?

Answer 10

Question 11

What is the equation for standard deviation?

Answer 11

Question 12

What is the equation for the coefficient of variation?

Answer 12