# Shared Flashcard Set

## Details

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

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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