Maths revision 2015

Primary data: collected yourself

Secondary data: collected by someone else 

Continuous data: we measure 

Discrete data: we measure 

Qualitive: word value

Quantitive: number value 

Population: all the items

Sample: selection from the population

Top tips:

• Use hand/sketch of hand
• 0 - on the thumb then number the other fingers in order 30, 45, 60 and then 90 on the pinky finger.
• Remember Sin is on the left and Cos is on the right.
• Square root and divide by 2.

Method:

• Put down/ scribble out the finger with the number you're trying to work out.
• which ever value you're doing (sin/cos) count the fingers which aren't put down in the right direction. 

Exapmle: ( find cos30 )