11.2 Types Of Sampling Flashcards

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1
Q

Sampling

A

Taking measurements of a limited number of individual organisms present in a particular area. Two types: random and non-random

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2
Q

Random sampling

A

Selecting individuals by chance. Random number generators must be used to there is no bias in the choosing.

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3
Q

Non-random sampling

A

3 types: opportunistic, stratified and systematic.

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4
Q

Opportunistic sampling

A

Uses organisms that are conveniently available

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5
Q

Stratified sampling

A

Some populations can be divided into strata (sub-groups). Random sample is taken from each strata proportional to relative size

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6
Q

Systematic sampling

A

Often involves belt or line transect. Samples areas at identical intervals

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7
Q

Sampling bias

A

Selection may be biased by accident or deliberately. Eg. Choosing a patch of flowers because it looks interesting.

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8
Q

Chance (reliability)

A

Organisms selected may, by chance, not be representative of the entire population. Eg. The 5 worms selected caught first may be the longest 5 in the habitat. Greater the sample size, the lower the likelihood of this occuring

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