Andy and Jeff Compare the Physical Development of Their Sons

question 90

Multiple Choice

Andy and Jeff compare the physical development of their sons. The baby boys are the same age. Andy brags that his infant son seems to be maturing at an advanced rate compared to what Jeff is observing in his son. Jeff worries that maybe there is something physically wrong with his son. Jeff consults a developmental book and finds that:

• A) not all children achieve the same physical skills in the same order
• B) all children achieve the same physical skills, just at varying times
• C) the sequence of acquiring physical skills varies between individuals
• D) the sequence of acquiring physical skills varies between cultures

---

Definitions:

Correlation

Correlation is a statistical measure that expresses the extent to which two variables change together. If the variables tend to increase and decrease in relation to each other, the correlation is positive; if one increases as the other decreases, it is negative.

Construct Validity

The degree to which a measurement device accurately measures the theoretical construct it is designed to measure.

Reliability

The consistency and stability of measurements or assessments over time.

Validity

The degree to which a tool, test, or measure accurately represents or measures what it claims to.