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# Download Mean The sum of the values in a set of data divided by the total

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```Mean
The sum of the values in a set of data divided
by the total number of values in a set.
Median
The middle value or the mean of the middle
values in a set of data when the data are
arranged in numerical order.
Mode
The value or values that appear most often in
a set of data.
Standard Deviation
A measure that is used to quantify the
amount of variation or dispersion of a set of
data values.
Percentile
The percentage of scores that fall at or
below a given score.
Population
The entire group of objects or individuals
considered for a survey.
Sample
A part of a population.
Bias
An error that results in a misrepresentation
of members of a population.
Observational Study
Individuals are observed and no attempt is
Experiment
An experiment or trial that uses controls,
usually separating the subjects into one or
more control groups and experimental groups
Survey
Used to collect information about a
population.
Simulation
The use of mathematical model to recreate a
situation with a known theoretical probability.
Convenience Sample
A sample of the most available subjects in the
population used to obtain quick results.
Voluntary Response Sample
Members of the population have volunteered
to participate.
Simple Random Sample
A sample in which every member of the
population has an equal chance of being
selected.
Stratified Random Sample
The population is divided into groups based on
a common characteristic and then a random
sample is chosen from each group
Systematic Random Sample
Members are put into order and the first
member is chosen randomly and then every
nth member is chosen after that
Cluster Sample
The population is divided into groups not
based on any common characteristic and then
a simple random of each group is chosen.
Normal Distribution
A continuous, symmetric, bell-shaped
distribution of a random variable.
Empirical Rule
The 68-95-99.7 rule provides a quick
estimate of the spread of data in a normal
distribution given the mean and standard
deviation.
Z-Score
The (positive or negative) number of standard
deviations that a given data value is from the
mean in a distribution.
Theoretical Probability
The number of ways that the event can occur
divided by the total number of outcomes.
Experimental Probability
The ratio of the number of times an event
occurs to the total number of trials or times
the activity is performed.
```
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