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Chapter 7 Vocab
n/a
11
Economics
Undergraduate 3
04/01/2012

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Term
Central Limit Theorem
Definition
As sample size gets large enough, sampling distribution is approximately normal. This is true regardless of the dist. of indiv. values. At least 30 values.
Term
Cluster Sampling
Definition
Dividing the N items in the frame into several clusters so that ceach cluster is representative of the entire population. Clusters are natrually occurring designations, such as counties, election districts, city blocks, households, or sales territories.
Term
Coverage Error
Definition
If certain groups of items are excluded from the frame so that they can have no chance of being selected in the sample. Results in selection bias.
Term
Frame
Definition
A listing of the items that make up the population
Term
Judgment Sample
Definition
Getting the opinions of preselected experts in the subject matter
Term
Measurement error
Definition
Such as ambiguous wording, Hawthorne effect, and respondent error.
Term
Nonresponse error
Definition
Failure to collect data on all items in the sample and results in a nonresponse bias.
Term
Sampling distribution of the mean
Definition
The distribution of all posssible sample means if you select all possible samples of a given size
Term
Sampling distribution of the proportion
Definition
Follows the binomial distribution. You can use normal distribution to approx. the binomial when n*pi and n(1-pi) are each at least 5.
Term
Sampling Error
Definition
Reflects the variation or "chance differences" from sample to sample.
Term
Unbiased
Definition
The mean of all the possible sample means (of a given sample size, n) is equal to the population mean
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