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SOC202 Chapter Six
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- 1Two kinds of estimation procedures1. Point estimate - used to estimate population value
2. Confidence Intervals - consist of a range of values instead of a single point - 2Margin of ErrorSize of a confidence interval
- 3Estimators can be selected according to two criteriabias and efficiency
- 4Bias-unbiased if the mean of its sampling distribution is equal to the population value of interest
- 5EfficiencyMatter of dispersion
- 6The smaller the standard deviation of a sampling distribution, thegreater the clustering and the higher the efficiency
- 7The larger the samplethe greater the clustering and the higher the efficiency
- 8Alphaprobability of error
- 990%0.10
- 1099%0.01
- 1199.90.001
- 1295%0.05
- 13Error barbased on the lower and upper limits of the confidence interval of a sample mean
- 14The width of a confidence interval can be controlled by1. the confidence interval can be raised or lowered
2. the interval can be widened or narrowed by gathering samples of different size - 15The relationship between interval size and confidence level is thatintervals widen as confidence levels increase
- 16As sample size increasesinterval width decreases
- 17—
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