May is a 4 yr old girl who is participating in a research study. She watches the researcher pour liquid from a short, fat container into a tall, thin container. Even though the liquid in the two containers was identical, May thinks there is more liquid in the tall, thin container. According to Piaget, May is in which stage of cognitive development?

Preoperational stage

Explanation:

According to Piaget, May is in preoperational stage of cognitive development which is usually between 2-7 years

Preoperational childrens thinking is semi-logical in some children shows  cognitive limitations in reasoning and their minds work in qualitatively different ways to those of adults

answer; i believe the correct answer is (a) the correlation between the cause variable and outcome variable is zero;