Meaures of Dispersion

Question 1

What is measure of dispersion?

Answer 1

How spread out (dispersed) the scores are

Question 2

What are 2 types of measures of dispersions?

Answer 2

• Range
• Standard deviation

Question 3

What is the range?

Answer 3

The difference between the highest and lowest values

Question 4

What is a strength of the range?

Answer 4

Easy to calculate, provides direct information which may be more useful than just the mean

Question 5

What is a weakness of the range?

Answer 5

This is affected by extreme values, it doesn’t take into account the number of scores

Question 6

What is standard deviation?

Answer 6

A measure which shows to what extent the values in a data set deviate from the mean

Question 7

What is a strength of standard deviation?

Answer 7

This is more precise because all the values are taken into account

Question 8

What is a weakness of standard deviation?

Answer 8

This is more difficult to calculate and understand, may hide the fact there are extreme values