What type of effect can a variable that is confounded with the treatment variable in a two group experimental study have on the obtained value of the t ratio it always makes t larger it usually makes t smaller it can make t either larger or smaller or leave it unchanged it generally has no effect on the size of the t ratio

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Question: What type of effect can a variable that is confounded with the treatment variable in a two-group experimental study have on the obtained value of

What type of effect can a variable that is confounded with the treatment variable in a two-group experimental study have on the obtained value of the t ratio?

it always makes t larger
it usually makes t smaller
it can make t either larger or smaller or leave it unchanged
it generally has no effect on the size of the t ratio

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