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In 1928,Frederick Griffith's experiments with Streptococcus pneumoniae suggested that
Dependent Variable
The variable in an experiment that is expected to change as a result of manipulations to the independent variable.
Experimenter's Manipulations
The deliberate alteration of variables by a researcher in an experiment to determine their effects on the outcome.
Standard Deviation
A commonly used measure of variability that indicates the average difference between scores in a distribution and their mean.
Arithmetic Mean
An average that is calculated by adding up a set of quantities and dividing the sum by the total number of quantities in the set.
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