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Sagot :
The predicted strength of a weld with diameter of 51 is -503.16.
Given that diameter of weld is 51.
And we have to find predicted strength of a weld.
We know that the equation of predicted strength is,
strength = -941.6 + (8.598 × D)
where D id diameter = 51
⇒ strength = - 941.6 + (8.598 × 51)
strength = -941.6 + 438.4
strength = -503.2
Therefore predicted strength of a weld is -503.2 i.e option (b) -503.16.
A prediction equation predicts a value of the response variable for given values of the factors. The Delphi Survey technique is a popular method used in prediction. There are two types of prediction methods: qualitative and quantitative.
The Least square Regression Line is the line that makes the vertical distance from the data points to the regression line as small as possible. It is called a "least squares" because the best line of fit is one that minimizes the variance.
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