某零售店近五个月的销售额和利润额资料如下表:
商店名称 | \(A\) | \(B\) | \(C\) | \(D\) | \(E\) |
销售额\(x(\)千万元\()\) | \(3\) | \(5\) | \(6\) | \(7\) | \(9\) |
利润额\(y(\)百万元\()\) | \(2\) | \(3\) | \(3\) | \(4\) | \(5\) |
\((1)\)画出散点图\(.\)观察散点图,说明两个变量有怎样的相关关系;
\((2)\)用最小二乘法计算利润额\(y\)关于销售额\(x\)的回归直线方程;
\((3)\)当销售额为\(4(\)千万元\()\)时,利用\((2)\)的结论估计该零售店的利润额\((\)百万元\()\).