KA 2: experimentation: sampling Flashcards

1
Q

where it is impractical to measure every individual..

A

..a representative sample of the population is selected

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2
Q

what determines the appropriate sample size?

A

the extent of the natural variation within a population

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3
Q

what do more variable populations require?

A

a larger sample size

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4
Q

what should a representative sample share?

A

the same mean and degree of variation about the mean as the population as a whole

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5
Q

describe random sample

A

members of the population have an equal chance of being selected

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6
Q

describe systematic sampling

A

members of a population are selected at regular intervals

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7
Q

describe stratified sampling

A

the population is divided into categories that are then sampled proportionally

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