During a research, the amount of Internet users was measured. Each time three random groups of 10,000 people of the average age of 20,40, and 60 were considered. The data are as follows (x₁ - the number of years since the beginning of the research, of users): - age, y-number y X1 X2 1400 1150 160 3000 2500 510 4450 4110 810 6190 5630 1220 1 20 1 >= i 40 1333 60 20 5 40 60 20 40 + i 5 5 (a) Fit a multiple linear regression model using x₁ and x₂ as the regressors. Round your answers to one decimal place (e.g. 98.7). (b) Estimate ². Round your answer to the nearest integer (e.g. 9876). 60 20 x₁ + i 7 40 60
During a research, the amount of Internet users was measured. Each time three random groups of 10,000 people of the average age of 20,40, and 60 were considered. The data are as follows (x₁ - the number of years since the beginning of the research, of users): - age, y-number y X1 X2 1400 1150 160 3000 2500 510 4450 4110 810 6190 5630 1220 1 20 1 >= i 40 1333 60 20 5 40 60 20 40 + i 5 5 (a) Fit a multiple linear regression model using x₁ and x₂ as the regressors. Round your answers to one decimal place (e.g. 98.7). (b) Estimate ². Round your answer to the nearest integer (e.g. 9876). 60 20 x₁ + i 7 40 60
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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Transcribed Image Text:During a research, the amount of Internet users was measured. Each time three random groups of 10,000 people of the average age of
20,40, and 60 were considered. The data are as follows (x₁ - the number of years since the beginning of the research, x₂ - age, > - number
of users):
y 1400 1150 160 3000 2500 510 4450 4110 810 6190 5630 1220
X1
X2
1
20
1
1
= i
40 60
3
20
3
40 60 20 40
3
+ i
5
5
(b) Estimate ².
Round your answer to the nearest integer (e.g. 9876).
5
60
(a) Fit a multiple linear regression model using x₁ and x₂ as the regressors.
Round your answers to one decimal place (e.g. 98.7).
} =
7
20
X₁ +
7
40
7
60
X2
Transcribed Image Text:(b) Estimate o².
Round your answer to the nearest integer (e.g. 9876).
32
=
se
i
(c) Find the standard errors of the regression coefficients.
Round your answers to one decimal place (e.g. 98.7).
=
; se
Number of users= i
=
i
; se
=
(d) Use the model to predict the number of users in random group of 40 years after 4 years of research.
Round your answer to the nearest integer (e.g. 9876).
i
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