A behaviorist has performed the following experiment.For each of 10 sets of identical twins who were born 30 years ago,he recorded their annual incomes,according to which twin was born first.The results (in $1,000s)are shown below.Can he infer at 5% significance level that there is a difference in income between the twins? 
Definitions:
Generativity
A stage of psychosocial development in which an individual focuses on guiding the next generation or contributing to the well-being of others, typically during middle adulthood.
Self-Concept
An individual's perception of themselves, encompassing beliefs, feelings, and thoughts about one's abilities, values, and identity.
Canada
A country in North America known for its vast landscapes, multicultural communities, and as the second-largest country by total area.
Japan
An island nation in East Asia, known for its rich culture, technological advancements, and historic sites.
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