When Pairs of Infants Are Brought Together in a Laboratory

question 86

Multiple Choice

When pairs of infants are brought together in a laboratory, __________ is/are present at 3 to 4 months.

• A) peer-directed smiles and babbles
• B) looking accompanied by occasional touching
• C) reciprocal exchanges and imitation of behavior
• D) viewing one another as playmates

---

Definitions:

Sample Mean

The average value found from a sample, which is a subset of a larger population.

Population

The entire group of individuals or instances about whom the study is focused, from which a sample may be drawn.

Sample Statistic

A numerical measurement describing a characteristic of a sample, used to estimate a population parameter.

Coefficient of Variation

A measure of relative variability that expresses the standard deviation as a percentage of the mean.