## Statistics Final

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

the sample proportion
-it is a statistic

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A good sampling method?
-small bias
-small variability

small variability means Higher Reliability
In a bulls-eye example what is a parameter and what is the statistic?
parameter = bulls-eye
statics= the shots
By using a LARGE SAMPLE, we are almost what?
close to the truth
In a LARGE SAMPLE how close are you usually to the truth?
95% of the time we are within that MARGIN OF ERROR
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.
What is the Margin of Error formula?
margin of error= 1/sq rt of n

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.
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.
What is a sample error?
They are errors caused by acts of taking a sample.
What is Random Sampling Error?
the deviation between a statistic and a parameter cause by chance in selecting a random sample.
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
-convenience sampling