A researcher randomly assigns patients with symptoms of dementia to a computer training program to improve inhibitory skills or a a control group, which is engages a computer training program for LinkedIn

A researcher randomly assigns patients with symptoms of dementia to a computer training program to improve inhibitory skills or a a control group, which is engages a computer training program for LinkedIn. Afterwards, the researcher administers an test of inhibitory skills that is too hard and every patient regardless of the condition to which they were assigned answers most questions inaccurately. The computer training program may have been effective, but a(n)----------------------------------------------------------------------- effect makes it impossible to tell.