Harriet reports feeling giddy whenever she thinks about her boyfriend. The giddiness is related to neurochemicals such as _______ and ________, which stimulates us and promotes feelings of attraction

A diagnosis of Alzheimer's disease is made

A) by administering a blood test. B) through exclusion, after ruling out other causes of dementia. C) by a physical examination. D) by taking an MRI image of the brain.

An individual at the 25th percentile would have a z score of approximately _____

a. +1 b. –.67 c. +.85 d. none of the above