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The phrase "a correlation was tested" is correct and usable in written English.
It can be used in research or academic contexts when discussing the examination of the relationship between two or more variables.
Example: "In the study, a correlation was tested between sleep duration and cognitive performance among participants."
Alternatives: "a correlation was examined" or "a correlation was analyzed".
Exact(1)
A correlation was tested for significance by the Spearman's rank correlation test.
Similar(59)
The new correlation was tested using a "one-off" validation procedure.
The correlation was tested using a t-test [28].
Correlation was tested with Spearman correlation.
Correlation was tested using Pearson's test.
Correlation was tested by Pearson test.
Nonparametric Correlation was tested according to Spearman.
Significance of the correlations was tested with a t-test with n - 2 degrees of freedom, where n = 98 is the number of hybrids in the factorial.
The correlations were tested against a large set of experimental data gathered from the work of different investigators over the past 50 years.
Correlations were tested using a two-sided Spearman's rank correlation coefficient.
The correlations were tested using a Pearson test.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com