MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER An economist is studying the job market in Denver area neighborhoods. Let x represent the total number of jobs in a given neighborhood, and let y represent the number of entry-level jobs in the same neighborhood. A sample of six Denver neighborhoods gave the following information (units in hundreds of jobs). 13 34 52 28 50 25 2 6 3 6 n USE SALT Complete parts (a) through (e), given Ex = 202, Ey - 27, Ex? = 7938, Ey? = 159, Exy = 1071, and r 0.7844. (a) Draw a scatter diagram displaying the data. 50 용 40 30 20 30 40 8. 9 x (total number of jobs (in hundreds)) x (total number of jobs (in hundreds)) 30 ntry-level jobs (in hundreds)) y (number of entry-level jobs (in hundreds) of entry-level jobs (in hundreds)) y(number of entry-level jobs (in hundreds))
MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER An economist is studying the job market in Denver area neighborhoods. Let x represent the total number of jobs in a given neighborhood, and let y represent the number of entry-level jobs in the same neighborhood. A sample of six Denver neighborhoods gave the following information (units in hundreds of jobs). 13 34 52 28 50 25 2 6 3 6 n USE SALT Complete parts (a) through (e), given Ex = 202, Ey - 27, Ex? = 7938, Ey? = 159, Exy = 1071, and r 0.7844. (a) Draw a scatter diagram displaying the data. 50 용 40 30 20 30 40 8. 9 x (total number of jobs (in hundreds)) x (total number of jobs (in hundreds)) 30 ntry-level jobs (in hundreds)) y (number of entry-level jobs (in hundreds) of entry-level jobs (in hundreds)) y(number of entry-level jobs (in hundreds))
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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Question
Transcribed Image Text:(b) Verify the given sums Ex, Ey, Ex, Ey, Exy, and the value of the sample correlation coefficient r. (Round your value for r to four decimal places.)
Σχ =
202
Ey
27
%3D
Ex?
1071
Ey?
= 7938
Exy = 159
r =
0.7844
(c) Find x, and y. Then find the equation of the least-squares line ŷ = a + bx. (Round your answers to four decimal places.)
X =
33.6667
y
4.5000
-0.2954
+ 0.1424
%3D
(d) Graph the least-squares line. Be sure to plot the point (x, y) as a point on the line.
8
5
20
30
40
50
30
40
50
x (total number of jobs (in hundreds))
x (total number of jobs (in hundreds))
50
50
40
20
40
evel jobs (in hundreds))
y (number of entry-level jobs (in hundreds))
1 jobs (in hundreds))
2.
3.
4,
y (number of entry-level jobs (in hundreds))
Transcribed Image Text:MY NOTES
ASK YOUR TEACHER
PRACTICE ANOTHER
An economist is studying the job market in Denver area neighborhoods. Let x represent the total number of jobs in a given neighborhood, and let y represent the number of entry-level jobs in the same neighborhood. A sample of six
Denver neighborhoods gave the following information (units in hundreds of jobs).
13
34
52
28
50
25
y
2
9
A USE SALT
Complete parts (a) through (e), given Ex = 202, Ey = 27, Ex = 7938, Ey = 159, Exy = 1071, and r 0.7844.
%3D
%3D
%3D
(a) Draw a scatter diagram displaying the data.
50
8
3
20
30
40
50
4
7
8.
x (total number of jobs (in hundreds))
x (total number of jobs (in hundreds))
50
8
40
30
2.
40
30
20
y (number of entry-level jobs (in hundreds))
of entry-level jobs (in hundreds))
3.
4.
y (number of entry-level jobs (in hundreds))
entry-level jobs (in hundreds)
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