Question
Asked Oct 2, 2019
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A least squares regression line was calculated to relate the length​ (cm) of newborn boys to their weight in kg. The line is weight = -5.69 + 0.1656 length. A newborn was 48cm long and weighed 33kg. According to the regression​ model, what was his​ residual? What does that say about​ him?

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Expert Answer

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Step 1

The provided information are:

The equation of the regression line is,  weight = -5.69+ 0.1656 length

Length = 48 cm

Observed Weight = 33 kg

The residual value can be calculated using the formula:

Residual = Observed value – Predicted value

Step 2

The predicted weight, for length = 48 can be calculated as:

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Predicted weight = -5.69 0.1656 length =-5.69 0.1656(48) -2.259

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Step 3

Thus, the resid...

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Residual Observed weight - Predicted weight =33-2.259 -30.741

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