A Study of 500 Pairs of MZ and DZ Twins

question 21

Multiple Choice

A study of 500 pairs of MZ and DZ twins done in Kentucky found that in terms of intelligence,

• A)the correlations between MZ twins and DZ twins were different.
• B)the correlations between DZ twins were about the same as those between other siblings.
• C)MZ twins were generally smarter than DZ twins.
• D)DZ twins were generally smarter than MZ twins.

---

Definitions:

Long Run

A period in economics where all factors of production and costs are variable, allowing all inputs to be adjusted.

Short Run

A period in which at least one factor of production is fixed, limiting the ability of a business to expand its output.

Isoquants

A curve representing all combinations of inputs that give the same level of output.

Production Function

An equation that describes the relationship between inputs and the maximum output that can be produced.