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STA 2023 > confidence intervals for proportions > Flashcards

confidence intervals for proportions Flashcards

1
Q

proportions mean?

A

percentages

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2
Q

SE(p-hat)

A

standard error
*SE = root(pq/n)
*used to find CI

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3
Q

CI equals..?

A

sample proportion mean(p-hat) +- z[SE(p-hat)]

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4
Q

ME (margin of error)

A

z*SE(p-hat)

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5
Q

what is needed to find a CI?

A

p-hat, n, CL

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6
Q

find z*?

A

invnorm[(1+CL)/2, 0, 1)

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STA 2023 (7 decks)

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