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Most developmental psychology studies use either longitudinal or cross-sectional research designs. Describe how a developmental psychologist could use a longitudinal design to study changes in fluid and crystallized intelligence as adults age. Then describe a similar cross-sectional study. Based on what you read about longitudinal and cross-sectional studies in Chapter 2 (How Psychologists Do Research), is it possible that the cross-sectional and longitudinal studies you propose could find conflicting results? If so, explain how.
Constant Opportunity Cost
A theoretical concept where the opportunity cost of producing a good remains constant as more of the good is produced.
Decrease In Unemployment
A reduction in the number of unemployed individuals in the workforce, often indicating economic growth.
Production Possibilities Frontier
A visual depiction illustrating the highest achievable production combinations of two products or services within an economy, assuming all resources are completely and effectively used.
Shift Outward
An economic term describing the expansion of a country's production possibility frontier, indicating increased capacity to produce goods and services.
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