Term

Definition
Probability is defined as a proportion, a specific part out of the whole set of possibilities. 


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Definition
A part of the whole.
Usually expressed as a fraction. 


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A sample obtained using a process that gives every individual an equal chance of being selected and keeps the probability of being selected constant over a series of selections. 


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Define:
Sampling with Replacement


Definition
A sampling technique that returns the current selection to the population before the next selection is made.
A required part of random sampling. 


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Define:
Normal Distribution


Definition
A symmetrical, bellshaped distribution with proportions corresponding to those listed in the unit normal table. 


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Define:
Unit Normal Table


Definition
A table listing proportions corresponding to each zscore location in a normal distribution. 


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A score that is identified by the percentage of the distribution that falls below its value. 


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Definition
The percentage of a distribution that falls below a specific score. 


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Define:
Binomial
Distribution


Definition
The distribution of probabilities, for each possible outcome, for a series of observations of a dichotomous* variable.
*Dichotomous Variable: A variable that is classified in exactly two categories (See also: Binomial) 


Term

Definition
(Number of ways event A can occur)
(Total number of possible outcomes) 


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Term
Define:
Distribution of Sample Means 

Definition
The set of sample means from all the possible random samples for a specific sample size (n) from a specific population. 


Term
Define:
Sampling Distribution 

Definition
A distribution of statistics (as opposed to a distribution of scores).
The distribution of sample means is an example of a sampling distribution. 


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Expected Value of M 

Definition
The mean of the distribution of sample means.
The average of the M values. 


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Standard Error of M 

Definition
The standard deviation of the distribution of sample means.
The standard distance between a sample mean and the population mean. 


Term
Define:
The Central Limit Theorem 

Definition
A mathematical theorem that specifies the characteristics of the distribution of sample means. 


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