Twin and Adoption Studies Done in the U

question 69

Multiple Choice

Twin and adoption studies done in the U.S.generally find a heritability coefficient of __________ for IQ scores.

• A) 10 to 30%
• B) 30 to 50%
• C) 50 to 70%
• D) 70 to 90%

---

Definitions:

Column Percentages

Percentages that represent the portion each category within a column constitutes of the column's total, often used in crosstabulation tables to analyze categorical data.

Poisson Distribution

A probability distribution that expresses the probability of a given number of events occurring in a fixed interval of time or space.

Significance Level

The significance level is a threshold in hypothesis testing, beyond which an observed effect is considered statistically significant, typically set at 0.05.

Fixed Interval

A concept in operant conditioning referring to a schedule of reinforcement where rewards are given after a specific, constant amount of time has passed.