sampling Flashcards

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1
Q

probability sampling

A

everyone from population have an equal chance of being selected

randomly selectcitng

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2
Q

homogeneous

A

jednorodny

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3
Q

systematic sampling

A

we get every xth part o population

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4
Q

stratified random sampling

A

dividing population into subpopulation and then selecting from each samples (we use proportional sampling from each subpop)

ex. divide to male and female and then into income, place …

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5
Q

sampling error

A

diffrence betwen the population and the sample

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6
Q

standard error

A

the measure of precision of a sample means (or sampling error)

SD sample/n^1/2

(standard dev is a measure of dispersion)

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7
Q

entail

A

wiązac się

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8
Q

cluster sampling

A

population divided into clusters and then we randomly chose which cluster is a sample (the whole cluster should be a sample - one stage or we sample from a cluster - 2 stage)

the lowest precision but cost and time efficient

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9
Q

convinience sampling

A

selecting easy to obtain or small cost data

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10
Q

judmental sampling

A

chosing based on knoledge

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11
Q

sampling

A

the bigger the sample the less error

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12
Q

standard error/standard dev

A

error - precision on a sample - will decrese when n will rise
dev - dispersion - constant

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13
Q

resampling

A

we dont know the pop but we know the sample

making a population from a sample.

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13
Q

bootstrap

A

computer generated resample

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14
Q

jackknife methon

A

we can only gain n resamples

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15
Q

central limit theorem

A

the distribution from large samples means would be normal regardles the shape of the pop. the more the sample the higher the distribution and thiner

16
Q

theorem

A

twierdzenie

17
Q

denote

A

oznaczać

18
Q

parameter

A

descriptive measure of a population characteristic