Biased and Unbiased Point Estimates

AP Statistics· difficulty 1/5

A random sample of 50 voters is taken from a city, and 32 of them favor a new ordinance.

Sample of 50 voters 32 favor / 50 sampled p̂ = 32/50 = 0.64

The value 32/50 = 0.64 is best described as which of the following?

  • A

    A statistic, x̄

  • B

    A parameter, p

  • C

    A parameter, μ

  • D

    A statistic, p̂

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Explanation

Because 0.64 was computed from a sample, it is a statistic — specifically the sample proportion p̂.

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