Calculations

Question 1

Standard deviation equation

Answer 1

SD=—

Question 2

1SD of mean

Answer 2

68% of all values

Question 3

2 SD of mean

Answer 3

95% of all values

Question 4

Why is standard deviation between than the range

Answer 4

Takes into account every value and each value’s distance from the mean
Range only takes highest and lowest value into account
SD is less affected by extreme values and anomalies

Question 5

What happens if SD bars overlap?

Answer 5

Likely to be due to chance