Lesson 3 -Basic mathematical
calculations used in statistics
Class Organisational Research Methodology IOP2601
Reviewed
This is a comprehensive summary of Lesson 3 in IOP2601. It
includes the demarcated information included in the prescribed
textbook as well as the study guide. If you choose not to buy the
Comments textbook, this summary fills in all the parts you would otherwise miss.
These notes are very useful in studying for assignments and using
as core study material.
Tredoux, C. & Durrheim, K. (2019). Numbers, hypotheses and
Sources conclusions: A course in statistics for the social sciences (3rd ed.).
Juta. [ISBN: 978 1 48512 544 0]
Order of Calculation
BoDMAS
1 Bo Brackets
2 D Division
3 M Multiplication
4 A Addition
5 S Subtraction
eg.
5 + 6 × (3 + 2) × 7 - 8 ÷ 2
= 211
Lesson 3 -Basic mathematical calculations used in statistics 1
, Multiply and Divide with Negatives
Minus × Minus = Plus Minus ÷ Minus = Plus
Plus × Plus = Plus Plus ÷ Plus = Plus
Minus × Plus = Minus Minus ÷ Plus = Minus
Plus × Minus = Minus Plus ÷ Minus = Minus
Fractions
Add and Subtract Fractions
Multiply Fractions
Lesson 3 -Basic mathematical calculations used in statistics 2