Statistics Final

Last update by Shanal on 10/23/2013
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What is p hat?

Answer:
the sample proportion
-it is a statistic

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    By using a LARGE SAMPLE, we are almost what?
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    In a LARGE SAMPLE how close are you usually to the truth?
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    What is the Margin of Error?
    the plus or minus percentage points we put around our proportion estimate.

    -margin of error +/- 3% means that if we repeatedly did the sample of the same population, 95% of the samples would fall within a 3% of the true population proportion.
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    What is the Margin of Error formula?
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    NOTE: that margin of error does not depend on the population size as long as the population is at least 100 times larger than the sample.
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    What is the Moral of Margin of Error?
    At a given level of confidence, an increase in sample size will decrease the margin of error.
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    What is a sample error?
    They are errors caused by acts of taking a sample.
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    the deviation between a statistic and a parameter cause by chance in selecting a random sample.
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    What is Undercoverage?
    It occurs when some groups in a population are left out of the sampling process or over-represented in the sample/
    -voluntary response
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    What is Stratified Random Sample?
    It is when you divide sampling frame into groups of individuals called strata.