Correlation coefficients indicate the: internal and external validity between variables. magnitude and direction of the relationship between variables. significance and variability between variables. cause-and-effect relationship between variable

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Explanation:

i guess that visual aids present persuasive examples to what you are presenting, some factors would be theme (does it fit with the color, information, what you are presenting), size (can you see it, is it a big enough span of data/information), and overall look of the visual aid.

hope this : )

no simpler subs form complex ones. synthesise = make