"Consistent with prior studies, a researcher found that self-esteem (low, high) impacts grades; high self-esteem was associated with better grades. The researcher also examined the effects of gender (male, female) on grades and found that being female is associated with better grades. The impacts of self-esteem and gender on grades are examples of effects."

Main

Explanation:

Consistent with prior studies, a researcher found that self-esteem (low, high) impacts grades; high self-esteem was associated with better grades. The researcher also examined the effects of gender (male, female) on grades and found that being female is associated with better grades. The impacts of self-esteem and gender on grades are examples of main effects."

Main effect (also called a simple effect) is the effect of one independent variable on the dependent variable. It ignores the effects of any other independent variables

The independent variables being self -esteem and females these are the two main effects on the dependent variable grades. These two variables and the effect on their grades self-esteem and female seem to be associated with high grades thereby making them the main effects of tjisnphenomena

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