Summary - Statistics 1 As level

STATISTICS 1

, Chapter 2 : Measures of location and spread

2. 1 Types of data
/
Qualitative Quantitativ
Inon-numerical Inumerical)

discrete data continous data
takes specific takes
any value

values in in the
a
given range
given range (weight)
I num of people)

2 2 .
modal/mode most repeated value
median-middle value
mean/average -
X
x = n X +
nzz
x = , ,




r n
,
+
Mz



2 3 . n - number of values Q -

median -




n
Q, lower &z quartile
quartile
3
n
- upper
- -
-




Y




2 4 .




range -
diff between largest and smallest value


IQR-inter quartile range -



Q3-Q ,
-




.5 E(x-y)2
Ex (x Sxx -2
2 varience = =
-
= =




n n




standard deviation
= =



=