A(n)         occurs when a person is physically present but unable to participate in any meaningful way in family interactions, as when a person is in a coma or in late stages of Alzheimer's disease.

Why is it essential that the experimental and control groups be treated identically in every respect but one?

a) so that the dependent variable can be accurately measured b) so that the results will apply outside the laboratory setting c) so that if the behavior of the two groups differs, the difference can be credited to the one thing that distinguished the groups from one another d) so that if the behavior of the two groups differs, the difference can be attributed to the independent variable

The success rate for artificial insemination is approximately ___?

15% 70% 35% 95%