N
Symbol
used for the number of subjects or data in a distribution. A study with 10 subjects would have an N equal to 10.
Naturalistic
Observation
A research method
where the subject(s) is(are) observed without
interruption under normal or natural
circumstances.
NCE
Score
A
standard score that sets the mean to fifty and standard deviation to 21.06, allowing the 99th percentile to have a score of 99 and the first percentile a score of
1.
Negative
Correlation
a correlation where one two variables tend to move in the opposite direction (example: the number of pages printed and the amount of ink left in your printer are negatively correlated. The more pages printed, the less ink you have left.)
Negative
Skew
A
curve or distribution of scores that has extreme scores below the mean that are atypical of the majority of scores.
Neuron
A
specialized nerve cell.
Neurotransmitter
A chemical found
in animals that plays a role in our behavior,
cognitions, and emotions.
Nightmare
A frightening
dream occurring in REM sleep.
Nominal
Scale
Any scale that contains no magnitude.
Often nominal is thought of as name only, meaning that
the variables of a nominal scale can be identified but
not measured.
Nondeclarative
Memory
A
subsystem
within Long term memory which consists of skills
we acquire through repetition and practice (e.g.,
dance, playing the piano, driving a car)
Nonparametric
Test
Any
statistic that is designed for ordinal or nominal data
or data that is not normally distributed
Norepinephrine
A
neurotransmitter associated with eating and alertness.
Too little has been associated with depression and too
much has been associated with schizophrenia.
Norm
An
expectation based on multiple observations.
Normal
Curve
A graphical
interpretation of a population that is ‘bell
shaped’ as it has the highest frequency in the
middle and this frequency diminishes the farther
you get from the center on either end. The
mean, median, and mode are all equal in a perfect
normal curve.
Normal
Distribution
The
scores of a sample or population that, when graphed,
fall on or close to a normal curve. A normal
distribution is often ideal in research because the
data can then be said to have all of the
characteristics of a normal curve.
Null
Hypothesis
The hypothesis that states there is no difference between two or more sets of data.
