# Shared Flashcard Set

## Details

psy 295 exam 2 chapter 6
exam flashcards
12
Psychology
11/15/2009

Term
 simple random sample
Definition
 every member of the population has an equal chance of being selected.
Term
 sample of convenience
Definition
 a sample in which a researcher uses the participants who are available for the study.
Term
 sampling error
Definition
 the difference between a sample statistic and a population parameter.
Term
 the central limit theorem
Definition
 makes predictions about the characteristics of a distribution of sample means.
Term
 M
Definition
 sample mean
Term
 3 properties of CLT
Definition
 1. the mean of the sample means is equal to the population m.2. the SD of the M is equal to the average distance a sample mean is from m. This property is also called the standard error of the mean.3. the distribution of all sample means, of a given size, forms a normal distribution.
Term
 grand mean
Definition
 mean of the means
Term
 standard error of the mean
Definition
 equal to the standard deviation of the sample means
Term
 standard error of the mean
Definition
 sigmaM = sigma/square root N
Term
 impact of sample size on sampling error
Definition
 the sample size has a direct influence on the standard error of the mean. The larger the sample size, the closer the sample mean will be to the population m. Also, the closer the sample mean is to the population m, the less sampling error will be encountered.
Term
 z statistic
Definition
 the distance an observed mean is from m, expressed in standard units. not the same as a z score !!
Term
 z statistic equation
Definition
 z= M-m ---- sigma Min words: z statistic = sample mean - population mean. Divided by standard error of the mean.
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