# Shared Flashcard Set

## Details

Psych 311 - Exam #2
Summer Session 2010 - Psych 311 - Elementary Statistics in Psychology - Exam #2 (Chapters 6-11)
20
Psychology
07/06/2010

Term
 Define:     Probability
Definition
 Probability is defined as a proportion, a specific part out of the whole set of possibilities.
Term
 Define:     Proportion
Definition
 A part of the whole.     Usually expressed as a fraction.
Term
 Define:     Random Sample
Definition
 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.
Term
 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.
Term
 Define:     Normal Distribution
Definition
 A symmetrical, bell-shaped distribution with proportions corresponding to those listed in the unit normal table.
Term
 Define:     Unit Normal Table
Definition
 A table listing proportions corresponding to each z-score location in a normal distribution.
Term
 Define:     Percentile
Definition
 A score that is identified by the percentage of the distribution that falls below its value.
Term
 Define:     Percentile Rank
Definition
 The percentage of a distribution that falls below a specific score.
Term
 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
 Formula:     p(A)
Definition
 (Number of ways event A can occur)   (Total number of possible outcomes)
Term
 Formula:     Z
Definition
 X – pn                         √npq
Term
 Formula:     μ
Definition
 pn
Term
 Formula:     σ
Definition
 √npq
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.
Term
 Define:     Expected Value of M
Definition
 The mean of the distribution of sample means.   The average of the M values.
Term
 Define:     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.
Term
 Formula:     σM
Definition
 σ           √n
Term
 Formula:     Z
Definition
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