The figure below shows the positions of particles in a longitudinal standing wave. One-quarter period later the particle distribution is shown in: 
Definitions:
Multiple R
Represents a measure of the correlation between observed and predicted values of a variable in multiple regression analysis, indicating the strength and direction of a linear relationship.
Autocorrelation
A measure of how correlated a variable is with itself over successive time intervals, often used in time series analysis.
Significance F
A statistical measure used in the analysis of variance (ANOVA) to determine the likelihood that the observed differences among group means occur by chance.
Null Hypothesis
A statistical hypothesis that suggests there is no significant difference between specified populations or no effect.
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