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PAPER 1 - Data & Probability
Data Collection (Sampling)
Stratified Sampling
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Stratified sampling
- where the
proportions
of each group of a
population
are representated in the sample.
Advantage of
stratified sampling
:
fairly represents each group
Disadvantage of
stratified sampling
:
more
time consuming
/
complicated
Stratified sampling sample
frame:
obtain a list of
elements
and
break
into
groups
calculate
proportions
: (
group
frequency
/
population
size
) x
sample
size
repeat for
each
group
,
rounding
values
conduct a
simple
random
sample
for each group