Quadratic Regression type Statistical Calculation
Example:
ABC Company investigate the effectiveness of the
advertisement expense in coded units, the following data were
obtained:
Please use the regression to estimate the effectiveness
(estimate the value of y) if the advertisement expenses X=30,
and estimate the advertisement expenses level (estimate the
value of X
1
, X
2
) for effectiveness y = 50.
(_+Cx
2
)
Advertisement expenses: X
18
35
40
21
19
Effectiveness: y (%)
38
54
59
40
38
30y
48.69615715
50x
1
31.30538226
50x
2
-167.1096731
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Key in operation
34
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