When the environmentally friendly cars came onto the market, many people were eager to buy them ____

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When the environmentally friendly cars came onto the market, many people were eager to buy them ________ the price.

A：wherever

B：however

C：whichever

D：whatever

上一题下一题 0.0难度选择题更新时间:2019-04-10 09:03:32

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D

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“奶茶妹妹”对某时间段的奶茶销售量及其价格进行调查，统计出售价x元和销售量y杯之间的一组数据如下表所示：

价格x	5	5.5	6.5	7
销售量y	12	10	6	4

通过分析，发现销售量y对奶茶的价格x具有线性相关关系．

（Ⅰ）求销售量y对奶茶的价格x的回归直线方程；

（Ⅱ）欲使销售量为13杯，则价格应定为多少？

注：在回归直线y= $\hat{b} x + \hat{a}$ 中， $\hat{b} = \frac{\sum_{i = 1}^{n} x_{i} y_{i} - n \bar{x} \bar{y}}{\sum_{i = 1}^{n} x_{i}^{2} - n {\bar{x}}^{2}}$ ， $\hat{a}$ = $\bar{y}$ ﹣ $\hat{b} \bar{x}$ ． $\sum_{i = 1}^{4} x_{i}^{2} = 5^{2} + {5.5}^{2} + {6.5}^{2} + 7^{2}$ =146.5．

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