Maths skills Flashcards
How do you calculate surface area to volume ratio?
surface area/volume
How to calculate surface area?
Area of shape X number of faces
How to calculate volume?
Length X Height X Width
Surface area of a sphere?
4πr2
Volume of a sphere?
4
3πr3
How to convert 1m to mm?
X1000
How to convert 1m to μm?
1m X1000 = 1000mm X1000 = 1000000μm
m to cm? cm to m?
X100 X100
What is the factor of a μm?
10 to the power of -9 10^(-9)
What is the factor of mm?
10 to the power of -3
What is the factor of km?
10 t the power of 3
m2
1000 X 1000 so conversion factor becomes 1000000
m3
1000 X 1000 so the conversion factor becomes 1000000000
How to calculate median;
Put the numbers in order from smallest to largest and count which one is in the middle.
Percentage change:
mass change/starting mass X 100
when the independent variable is continuous data, you should use a …?
Line graph
When your independent variable has discrete date, you should use a …?
Bar chart
When your categoric data is in groups that can be arranged on a continuous scale, you should use …?
A histogram
When is a student t test used?
To judge the significance of any difference between the means of sets of data that are collected from 2 groups.
