One study of adult involvement in household tasks revealed greater similarities between the United Kingdom and the United States compared with France,Belgium,and French Canada.Thus,the United States and United Kingdom were "twins" based on common language.This study is an example of:

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The study groups countries based on similarities in adult involvement in household tasks, identifying clusters of countries with similar patterns. Cluster analysis is a statistical method used to group objects (in this case, countries) that are similar to each other.

One Study of Adult Involvement in Household Tasks Revealed Greater