1.0(Ⅰ)試畫出散點圖, 查看更多

 

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某種產(chǎn)品的廣告費支出x與銷售額y(單位:萬元)之間有如下對應(yīng)數(shù)據(jù):
P(k2>k)0.500.400.250.150.100.050.0250.0100.0050.001
  k0.4550.7081.3232.0722.7063.8415.0246.6357.87910.83
x24568
y3040605070
(Ⅰ)畫出散點圖;
(Ⅱ)求回歸直線方程;
(Ⅲ)試預(yù)測廣告費支出為10萬元時,銷售額多大?

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某種產(chǎn)品的廣告費支出x與銷售額y(單位:萬元)之間有如下對應(yīng)數(shù)據(jù):
P(k2>k)0.500.400.250.150.100.050.0250.0100.0050.001
  k0.4550.7081.3232.0722.7063.8415.0246.6357.87910.83
x24568
y3040605070
(Ⅰ)畫出散點圖;
(Ⅱ)求回歸直線方程;
(Ⅲ)試預(yù)測廣告費支出為10萬元時,銷售額多大?

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某種產(chǎn)品的廣告費支出x與銷售額y(單位:萬元)之間有如下對應(yīng)數(shù)據(jù):
P(k2>k)0.500.400.250.150.100.050.0250.0100.0050.001
  k0.4550.7081.3232.0722.7063.8415.0246.6357.87910.83
x24568
y3040605070
(Ⅰ)畫出散點圖;
(Ⅱ)求回歸直線方程;
(Ⅲ)試預(yù)測廣告費支出為10萬元時,銷售額多大?

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某種產(chǎn)品的廣告費支出x與銷售額y(單位:萬元)之間有如下對應(yīng)數(shù)據(jù):
P(k2>k)0.500.400.250.150.100.050.0250.0100.0050.001
  k0.4550.7081.3232.0722.7063.8415.0246.6357.87910.83
x24568
y3040605070
(Ⅰ)畫出散點圖;
(Ⅱ)求回歸直線方程;
(Ⅲ)試預(yù)測廣告費支出為10萬元時,銷售額多大?

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在研究硝酸鈉的可溶性程度時,對于不同的溫度觀測它在水中的溶解度,得觀測結(jié)果如下:
溫度(x) 0 10 20 30 40
溶解度(y) 65 74 87 96 103
(1)畫出散點圖;
(2)求出線性回歸方程
y
=bx+a;
(3)當(dāng)溫度為70度時,試估算此時硝酸鈉的溶解度為多少?

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