stats 10

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Author:
famay
ID:
74520
Filename:
stats 10
Updated:
2011-03-22 16:12:51
Tags:
chapt
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Description:
parameter est.
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  1. Point Estimator
    The mean of the sample is called a point estimator. It provides a single point or value as an est of the pop parameter.
  2. Unbiased Estimator
    is a statistic that has a sampling distribution with a mean exactly equal to the pop parameter being used.
  3. Confidence Interval
    is a range of values constructed to have specific probability of including the pop parameter, the mean.
  4. Confidence level
    The greater the confidence level (1-alpha) , the greater the probability that the interval will actually include (mue)
  5. 95% Confidence level-
    • 1. alpha - .05 - cv= 1.96 nondirectional
    • 2. better level due to the width of the interval being.
    • 3. .05 the the interval will miss the mue
  6. 99% Confidence level-
    • 1. alpha - .01 - cv= 2.58
    • 2. less precise due to the large width of the interval.
    • 3. .01 will miss the inteval.
  7. Size of St. Error of the Mean.
    • 1. as the st. error decre, so does the width of the confidence interval.
    • 2. Incre in n results in more information confidence interval.

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