you will see this basic scenario presented for 3 questions (all in green so you can find others more easily). You conduct a study to investigate the effect of Instructions (written vs. pictorial) on how long it takes to put a coffee table together. You decide which participants get which instructions by flipping a coin. Based on the description, which of the following would be most likely to confound your study? amount of time needed to read instructions how many times participants assembled coffee tables in the past age participants' hand-eye coordination