Studied by 1 person
parallel lines
same gradient
perpendicular lines
negative reciprocal gradient (1/2 → -2/1)
formulas for perpendicular lines
m1 x m2 = -1
m2 = -1/m1
mean
sum of data divided by number of data
median
middle number/ Q2
mode
most frequent data
range
max-min
IQR
Q3 - Q1
Upper Fence (outliers)
Q3 + 1.5 x IQR
Lower Fence (outliers)
Q1 - 1.5 x IQR
Categorial
Not numbers- Nominal, Ordinal
Numerical
Numbers- discrete, continuous
Nominal
categorial, no order (eg colours)
Ordinal
categorial, can be ordered (eg low med high)
Discrete
Numerical, Limited values (eg children in family)
Continuous
Numerical, any range (eg time to complete race)
Note 
Flashcard (102)