请教一个 Business Analyst 的问题

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Question No. 48
a linear model has the following characteristics:

a dependent variable (y)
one continuous variable (x1), including a quadratic term (x12)
one categorical (d with 3 levels) predictor variable and an interaction term (d by x1)

how many paramters, including the intercept, are associated with this model?

答案是7，请教一下大家是怎么的出来的。谢谢哈

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关键词：Business Analyst Analys Analy Anal Business

截距、x1、x1的平方、3个水平的分类变量转化为两个哑变量、两个哑变量分别和x1的交互项

非常感谢

非常感谢你的回复。能否在帮我看看第58题，因为有图，不太好表示。大意就是 25% of the customers who did not make a purchase are incorrectly classified as purchasers. 正确选项为， 85% of the customers who did make a purchase are correctly classified as making a purchase.这道题确实没理解。