Range, Varience, Standard Deviation

Question 1

Two signs for variance

Answer 1

S squared (s little 2) 
Ó squared (ó little 2)

Question 2

Two signs of standard deviation

Answer 2

S or ó

Question 3

What is range and how do you find it

Answer 3

Range is the difference between the largest and smallest values of a data distribution

Range= highest value- lowest value

Question 4

What is standard deviation

Answer 4

Standard deviation is the square root of the average of the square of the distance each value is from the mean of the data set

Question 5

What is variance and how do you find it

Answer 5

Variance is the square of the standard deviation

Variance= (Standard Deviation)2

Question 6

What is the difference in the set ups between popular standard deviation and Samble standard deviation

Answer 6

Popular Standard deviation is divided by N

Sample standard deviation is divided by n-1

Question 7

Name the 6 steps to finding standard deviation

Answer 7

1) find the mean
2) find the differences (minus all each number in the data set by the mean)
3) Square the results of step 2
4) find the sum of the squared results from step 3
5) divide by N or n-1 (depending on whether you are working with a population or sample) (the answer of step 5 is variance
6) take the square root of the results (this is standard deviation)

Question 8

What is the coefficient of variation and how is it given

Answer 8

A statistic that expresses the standard deviation as a percentage of the mean

You take the outcome of Standard deviation divided by the mean times 100