Measure Of Dispertion

Question 1

What is central tendency ?

Answer 1

Calculates middle or average measure of dispersion that tells us spread of data. E.g. range, variance, standard deviation.

Question 2

What is variance ?

Answer 2

Spread of scores around the mean. Small variance = similar scores close to the mean.

Question 3

What is standard deviation?

Answer 3

Square root of the variance so tells us average amount of a miner differs from the mean. Puts figure in readable format.

Question 4

How to work out SD

Answer 4

D iffernce from the mean
S quare the difference
S um of the square
D ivide by (n-1)
S quare root variance