nd believes that the number ne caregi Page ome data is provided below: 1 s the score Jords Per Day (x): ¤ = 1742

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter7: Distance And Approximation
Section7.3: Least Squares Approximation
Problem 31EQ
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A psychology student is studying human development
and believes that the number of words spoken per day by
the caregi Page 1 s the score on a reading test at age 8.
Some data is provided below:
Words Per Day (x): x = 17422,
3506.492
%3D
Test Score (y): y = 85,
= 7.176
Sy
The correlation between Words Per Day and Test Score
is r = 0.998.
(a) Find the least squares regression line.
(b) Predict the test score for a child whose caretaker
spoke 12620 words per day
Transcribed Image Text:A psychology student is studying human development and believes that the number of words spoken per day by the caregi Page 1 s the score on a reading test at age 8. Some data is provided below: Words Per Day (x): x = 17422, 3506.492 %3D Test Score (y): y = 85, = 7.176 Sy The correlation between Words Per Day and Test Score is r = 0.998. (a) Find the least squares regression line. (b) Predict the test score for a child whose caretaker spoke 12620 words per day
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