Which of the following is necessary to reach a sound conclusion?

Question

Quizplus · Accepted Answer

A sound conclusion is reached when the data collected is valid (free from errors and bias). Either of these (errors and/or bias) can result in unusable data, since the validity cannot be determined. When this happens, conclusions cannot be drawn and experiments often have to be redesigned and performed again.
Not all experiments need to be complex in order to reach a sound conclusion. Also, experiments are testing the effect of an independent variable on the dependent variable.

Which of the Following Is Necessary to Reach a Sound