Answered: Suppose a graduate student does a…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Suppose a graduate student does a survey of undergraduate study habits on his university campus. He collects data on students who are in different years in college by asking them how many hours of course work they do for each class in a typical week. A sample of four students provides the following data on year in college and hours of course work per class:

Student	Year in College	Course Work Hours per Class
1	Freshman (1)	7
2	Sophomore (2)	5
3	Junior (3)	4
4	Senior (4)	4

Think about how close the line Y = –2X + 9 is to the sample points. Look at the graph and find each point’s vertical distance from the line. If the point sits above the line, the distance is positive; if the point sits below the line, the distance is negative.

The sum of the vertical distances between the sample points and the orange line is ___?___ , and the sum of the squared vertical distances between the sample points and the orange line is ___?___ .

On the graph, place the black point (X symbol) on the graph to plot the point (MXX, MYY), where MXX is the mean year for the four students (1, 2, 3, and 4) in the sample and MYY is the mean hours of course work per class for the four students (7, 5, 4, and 4) in the sample.

Then use the green line (triangle symbols) to plot the line that has the same slope as (is parallel to) the line Y = –2X + 9, but with the additional property that the vertical distances between the points and the line sum to 0. To plot the line, drag the green line onto the graph. Move the green triangles to adjust the slope.

The line you just plotted __?__ through the point (MXX, MYY).

The sum of the squared vertical distances between the sample points and the line that you just plotted is ___?__ .

Which of the following describes the plotted line with the smallest total squared error?

a) Y = –2X + 9

b) Neither—the two lines fit the data equally well

c) The line you plotted that has a sum of the distances equal to 0

Suppose you fit the regression line to the four sample points on the graph. On the basis of your work so far, being as specific as you can be, you know that the total squared error is ________?_________ .

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