All of the following are possible explanations for experiment results that do not support the researcher’s predictions except committing a type 2 error.
inadequate manipulation of the independent variable.
masking of the treatment effects by extraneous variables.
using dependent variables with a low floor and high ceiling.

i disagree that there is little difference between adult female development and adult male development. sociological studies comparing female and male pathways to adulthood, revelead that there are sustancial differences between them. particularly, female and male differ from timing of marriage, when they began to live with children and the likelihood of combining wife/husband and parent roles.

answer; humanistic;