These are notes covering all of Year 1 Statistics. They include key concepts and use examples to solidify the content. These notes helped me achieve an A*.
, Sampling
RandomSampling
....
Give number to each population member , from full list of the
·
a a
population
Generate list of random numbers
·
a
Match these numbers the members select
to
population to
your sample
·
Advantages member of the population has an equal chance
-
Every
of beingbe selected ,
so it's
completed unbiased
Disadvantages -
It can inconvenient if the
population is spread over a
large area it
might be difficult to track down
selected members
Systematic sampling. ..
Give number to each population member from full list of
·
a a
,
the population
Calculate regular internal to by dividing the
population
·
a use
size
by the sample size
that is less than
Generate random
starting point equal to the
·
a
The member of the population is
Six of the interval .
corresponding
the first member of
your sample Keep .
adding the internal to the
starting point to select
your sample
Advantages -
It can be used
for quality control on a
productions a
machine can be set to
up sample every n items . It should
also unbiased sample
give an
Disadvantages The interval could coincide with pattern which
-
regular a
could lead to kids
Opportunity Sampling. ..
·
A
sample is chosen from a section of the population at a
particular
, place and time whatever is convenient for the sampler
Advantages -
Data can be gathered very quickly and
easily
Disadvantages It isn't random and be biased the
very
-
can as
sampler choses which sections of the population
to sample
Sampling....
Stratified
·
Divide the population into categories
·
Calculate thetotal population
Calculate number needed for each in the sample using
:
category
·
Size ofcategor=
y Sireofcategoryinpopulation x total is
sampl
Select the sample for each random
category at
·
the divided up into distinct
Advantages If -
population can be
categories ,
it's
likely to
give a representative sample
. Its
useful when results
may very depending obvious
category
on
Disadvantages It's not useful when there aren't categories
any
.
It can also be expensive because of the extra detail
involved
Quota
Sampling...
Divide the population into
categories
·
·
Give each
category a
quota (number of members to sample)
·
Collect data until the quotas are met in all categories
Advantages- It can be done when there isn't
of the a
full list
population
.
Every sample member member responds because
the interviewer continues to sample until all
quotas are met
Disadvantages - It can be
easily based by the interviewer
,
Voordelen van het kopen van samenvattingen bij Stuvia op een rij:
Verzekerd van kwaliteit door reviews
Stuvia-klanten hebben meer dan 700.000 samenvattingen beoordeeld. Zo weet je zeker dat je de beste documenten koopt!
Snel en makkelijk kopen
Je betaalt supersnel en eenmalig met iDeal, creditcard of Stuvia-tegoed voor de samenvatting. Zonder lidmaatschap.
Focus op de essentie
Samenvattingen worden geschreven voor en door anderen. Daarom zijn de samenvattingen altijd betrouwbaar en actueel. Zo kom je snel tot de kern!
Veelgestelde vragen
Wat krijg ik als ik dit document koop?
Je krijgt een PDF, die direct beschikbaar is na je aankoop. Het gekochte document is altijd, overal en oneindig toegankelijk via je profiel.
Tevredenheidsgarantie: hoe werkt dat?
Onze tevredenheidsgarantie zorgt ervoor dat je altijd een studiedocument vindt dat goed bij je past. Je vult een formulier in en onze klantenservice regelt de rest.
Van wie koop ik deze samenvatting?
Stuvia is een marktplaats, je koop dit document dus niet van ons, maar van verkoper taneshm07. Stuvia faciliteert de betaling aan de verkoper.
Zit ik meteen vast aan een abonnement?
Nee, je koopt alleen deze samenvatting voor €14,21. Je zit daarna nergens aan vast.