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Statistics
Univariate Data
Sampling
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Cards (18)
what is a population?
a
set
of
things
we want to
study
when we take a census what do we do?
collect
data about
every
member of the
population
What is the Pro of using a Census?
There is
data
for
every
member of the
population
What is the cons of using a census?
May not have a sampling
frame
Time
consuming and expensive
Might be
destructive
What can you do instead of taking a census?
Take a
sample
of the
population
what is a sample?and why is it used?
Any subset of a population and used to make inferences about the entire populations
what is inferential statistics?
where it help you come to
conclusions
and make
predictions
based on your
data
what is quota sampling?
Where a researcher makes sure that the
proportions
of
groups
in their sample are the
same
as they are in the
population.
What are the Pros of Quota sampling?
more
representative
sampling than
Opportunity
Quick
,
Cheap
and
easy
Easy to
compare data
groups within a
sample
What are the Cons of Quota Sampling?
May not be very
representative
Need the
correct
data of the population to create
Quotas
What is systematic sampling?
Where every
nth element
in a
population
is
selected
to be part of the
sample.
what are the Pros of systematic sampling?
More likely to get a
representative
sample that with
opportunity
sampling or
quota
sampling
You
don't
need to randomly select every member of your sample
what are the cons of systematic sampling?
you need a
sampling
frame
There are certain samples that you can
never
get
still doesn't guarantee a
representative
sample
What is stratified sampling?
the process of creating
subgroups
in a
dataset
according to various factors, such as
age.
what is Strata?
A
subset
of the
population
which is being sampled.
What are the pros of stratified sampling?
very likely to give a really
representative
sample
what are the cons of stratified sampling?
can be tricky to decide which group in your population are the most
important
incredibly
time-consuming
to do well
miss lable variables within
strata
what type of sampling is very different to Quota sampling?
Stratified
sampling
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