Measurement, scales , numbers, rates, ratios and risk Flashcards

1
Q

whats the purpose of statistics

A

to infer about the population

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2
Q

how to make inferences about the entire population

A
  • take a sample and then generalise that the population
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3
Q

samplulation population must be

A

representative

unbiased

precise

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4
Q

types of errors that can occr in a study that maybe affect results

A
  • chance (random) error
    • due to samping variation
    • reduced as sample size increases
  • Bias (systematic error)
    • bias is quantified by the difference between the true value and expected value
    • increasing sample size doesnt eliminate it
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5
Q

why does increase population decrease random error

A

increase in precision i.e can estimate the mean better (reduce uncertainty )

helps with targetting certain outcomes

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6
Q

systematic error sources

A
  • selection bias ; when sampling study smaple
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