In explaining the amount of money spent on gifts for a child's birthday each year,the independent variable,age of child,is best represented by a dummy variable.

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The age of a child is a quantitative variable that can take on multiple values (e.g., 1 year, 2 years, etc.), making it more suitable for representation as a continuous variable rather than a dummy variable, which is typically used for categorical variables with two categories (e.g., yes/no, male/female).

In Explaining the Amount of Money Spent on Gifts for a Child's