To establish split-half reliability you must administer the same measurement to the same group of people at two different times

Reba has been accurately diagnosed as being affected by organic intellectual disability. Which statement about Reba would ALWAYS be true?

a. Reba's disability is due to some identifiable biological cause. b. Reba's level of disability would be either severe or profound. c. Reba was raised in an understimulating environment. d. Reba has three 21st chromosomes.

Strayer and Johnston were investigating the link between cell phone use and the ability to react to environmental stimuli. While the participants tracked a moving target using a joystick, they were required to press a button each time a red light flashed at random points on a computer screen. While completing the task, one group used a hand-held cell phone to carry on a conversation, one group

used a hands-free cell phone, and one group was not engaged in any conversation. The researchers measured the time that elapsed between the appearance of the red light and the button press. The results from this study suggested that compared to the group that was not engaged in any conversation, people engaged in a cell phone conversation: a. detected the red light each time it was present, but were slower to react to the red light b. failed to detect the red light more often, but had equally quick reaction times when the red light was detected c. only showed slower reactions times if they were using a hand-held cell phone d. failed to detect the red light more often, and were slower to react to the red light when it was detected