STAT 100 Lecture 1: simple random sample

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31 May 2018

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Advantage of SRS -

1Representative :the Sample tends to look like the

population

@Statistics based on the sample tend to be

close to statistics based on Pop.

3Provide typical deviations of sample stats from

population vahes

$Fertility of mowers aged 40-44

number

of children

234C4th

u% 43% a3% 13%

Biased =under counting

400 SRS =pop arg :2.28 >one time

Sample avg =2.29

asample AVG from aSRS will fall Close to true population

mean

Mae

Can we make up no SRS for big data ?

(More :Meng 2oB ,Atrio of inference

problems that could win you aNobel Prize in Stats )

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