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Which situation is an example of bivariate data?以下有几个选项

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Which situation is an example of bivariate data?以下有几个选项
A.The number of pizzas Tanya eats during her years in high school
B.The number of times Ezra puts air in his bicycle tires during the summer
C.The number of home runs Elias hits per game and the number of hours he practices baseball
D.The number of hours Nellie studies for her mathematics tests during the first half of school year
3Q...
Which situation is an example of bivariate data?以下有几个选项
ivariate data是双变量数据,不是说取值只有两个(比如0,1),而是说这种数据有两个数值,形如(x,y).
所以我觉得是C,只有C在一项中描述了两种数字:全垒打次数和练习时间.