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Psychology Statistics
Vocab
22
Psychology
Undergraduate 2
03/21/2011

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Term
parameter
Definition
term used to describe characteristics of a population
Term
statistic
Definition
term used to describe characteristics of a sample
Term
population
Definition
The entire group of individuals we are interested in studying
Term
sample
Definition
The subset of individuals in the population that we actually study
Term
nominal
Definition
Represents differences between individuals
Term
ordinal
Definition
Represents differences between individuals
Indicates order of individuals
Term
Interval
Definition
Represents differences between individuals
Indicates order of individuals
Intervals between values are equal
Term
Ratio
Definition
Represents differences between individuals Indicates order of individuals
Intervals between values are equal
A true zero point exists
Term
data
Definition
multiple measurements or observations
Term
data set
Definition
a collection of measurements or observations
Term
datum / data point / score
Definition
a single measurement or observations
Term
sampling error
Definition
the difference between a statistic and its corresponding parameter
Term
descriptive statistics
Definition
statistical procedures that summarize, organize, and simplify data
Term
inferential statistics
Definition
techniques that allow us to generalize results from samples to populations
Term
variables
Definition
characteristics or conditions that change or take on different values
Term
independent variables
Definition
variables manipulated by the experimenter
Term
dependent variables
Definition
variables that are observed or measured
Term
discrete variables
Definition
separate, indivisible categories
(ex: months, political parties, psychological disorders)
Term
continuous variables
Definition
divisible into an infinite number of parts
(ex: age, time, length)
Term
real limits
Definition
Boundaries that separate intervals on a continuous variable
Term
N and n
Definition
N = number of individuals in the population
n = number of individuals in a sample
Term
Sum of scores = ∑ X
Definition
X=1592108
∑X=1+5+9+2+1+0+8
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