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Sampling3

# Sampling3 - Population Percent 100 1000 White 589208 98.61...

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Click to edit Master subtitle style Sampling 3.4.2011

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Announcements n Midterm Exam: F 3/18 n Home works: Chapter 8 due on Wed.  unless you want back before the exam.
INFINITE DRAWS, SAMPLE SIZE  10 25% 5 red cards 41% 4 or 6 red cards 66% 4-6 red cards

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Repeated Sampling n The long run average from repeated  sampling is equal to the population  parameter.
Confidence Intervals The probability that the population mean  value actually falls within a range of  estimated mean values.

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Confidence Intervals n As the standard deviation increases, the width of  the interval increases. n As the sample size increases, the size of the  interval decreases.
n Example: 50% of Americans approve of the way President  Obama is handling this job as president (with a margin of  error of +/- 4%). n We can conclude that: n  The sample has about 1000 people. n  That the range of approval is 46-54%.

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Example Expected Number for Samples of Group

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Unformatted text preview: Population Percent 100 1000 White 589208 98.61 African American 3063 0.51 Asian 5217 0.87 Total 597488 99.99 Example Expected Number for Samples of Group Population Percent 100 1000 White 589208 98.61 98 986 African American 3063 0.51 1 5 Asian 5217 0.87 1 9 Total 597488 99.99 100 1000 Disproportionate Samples n Weighting factor – used to make disp. Sample representative. What is the Sampling Fraction for each? Final Sample Size Sampling Fraction White 50 1 African American 25 4.5 Asian 25 3.5 Total 100 Weighting Factors for each? Final Sample Size Weighting Factor White 50 1 African American 25 4.5 Asian 25 3.5 Total 100 Weighting Factors for each? Final Sample Size Weighting Factor White 50 1 0.9861 African American 25 4.5 0.0051 Asian 25 3.5 0.0087 Total 100 What is the overall weighted mean? Final Sample Size Weighting Factor White 50 1 0.9861 0.9861 African American 25 4.5 0.0051 0.02295 Asian 25 3.5 0.0087 0.03045 Total 100 1.0395...
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Sampling3 - Population Percent 100 1000 White 589208 98.61...

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