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By the age of 24 months, most children can climb steps, walk backward, and kick a ball.

​The entire group of individuals that is the focus of interest in a research study is called the sample, while the small subset of group that is actually studied is called the population.

Parents are more effective than videos in teaching new words to their children.

​If a dominant gene meets up with a recessive gene, the traits that are contained in the dominant gene will ultimately be expressed.

​The biggest limitation of conducting correlational research is the lack of ability to draw conclusions about cause-and-effect relationships.

Tosha is playing jacks, and each time she bounces a ball she has to pick up one additional jack. She uses private speech as she counts the number of jacks in her head rather than out loud.

​Classical conditioning focuses on the relation between the consequences of behavior and the likelihood that the behavior will recur.

​Only a single sperm cell can successfully make the journey up a woman’s Fallopian tube to an unfertilized egg.

​Jessminder is a two-year-old girl who is exploring her world. She can walk very well, and frequently tries to walk away from her parents to go look around. According to Erikson, Jessminder is attempting to develop a sense of ____.

​An extension of intentional behavior, wherein a child will start ‘experimenting’ with different actions and repeating them when they produce pleasant outcomes, usually appears at approximately