B & C

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
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ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter4: Equations Of Linear Functions
Section4.5: Correlation And Causation
Problem 2AGP
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HW 3.4 Need help with B & C
The following table shows both current and projected data on the number, in
millions, of Facebook users in a certain country.
F = number of Facebook
t = years since 2012
users (millions)
9.7
1
10.5
11.3
12.2
4
13.1
5
13.2
6
13.8
(a) Plot the data.
F
20
20
15
15
10.
10
5
t
8
4
6
4
6
F
F
20
20
15
15
10
10
5
t
8
2
4
6
6
8
(b) Find the equation of the regression line. (Round regression line parameters
to two decimal places.)
F(t) = -0.3(1) + 9.7 x
Transcribed Image Text:The following table shows both current and projected data on the number, in millions, of Facebook users in a certain country. F = number of Facebook t = years since 2012 users (millions) 9.7 1 10.5 11.3 12.2 4 13.1 5 13.2 6 13.8 (a) Plot the data. F 20 20 15 15 10. 10 5 t 8 4 6 4 6 F F 20 20 15 15 10 10 5 t 8 2 4 6 6 8 (b) Find the equation of the regression line. (Round regression line parameters to two decimal places.) F(t) = -0.3(1) + 9.7 x
(b) Find the equation of the regression line. (Round regression line parameters
to two decimal places.)
F(t) = -0.3(t) + 9.7 x
Add the graph of the regression line to the plot from part (a).
F
20
20
15
15
10
10
4
6
8
F
20
20
15
15
10
10
5
4
6
4
6
(c) Explain in practical terms the meaning of the slope of the regression line.
(Round your answers to two decimal places).
The slope of the regression line is
x million users per year. The
slope means that, from 2012 on, the number of Facebook users in the
country is expected to increase by
x million each year.
Transcribed Image Text:(b) Find the equation of the regression line. (Round regression line parameters to two decimal places.) F(t) = -0.3(t) + 9.7 x Add the graph of the regression line to the plot from part (a). F 20 20 15 15 10 10 4 6 8 F 20 20 15 15 10 10 5 4 6 4 6 (c) Explain in practical terms the meaning of the slope of the regression line. (Round your answers to two decimal places). The slope of the regression line is x million users per year. The slope means that, from 2012 on, the number of Facebook users in the country is expected to increase by x million each year.
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