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Q. 1.2

The Practice of Statistics for AP
Found in: Page 169
The Practice of Statistics for AP

The Practice of Statistics for AP

Book edition 4th
Author(s) David Moore,Daren Starnes,Dan Yates
Pages 809 pages
ISBN 9781319113339

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Short Answer

Some data were collected on the weight of a male white laboratory rat for the first 25 weeks after its birth. A scatterplot of the weight (in grams) and time since birth (in weeks) shows a fairly strong, positive linear relationship. The linear regression equation weight = 100 + 40(time) models the data fairly well.

2. What’s the y intercept? Explain what it means in context.

The value of y-intercept a is 100

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Step by Step Solution


We are given the linear regression equation of weight on time:

weight = 100 + 40(time)


We know that for a linear regression equation of the form:


The value of y-intercept is a.

Therefore value of y-intercept for the given equation will be 100.


The value of y-intercept that is a=100 means that if we were to keep the value of time 0, weight will be 100. That is initally we assume the weight to be 100 units.

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