Answered: 12 10 + 4+ 150 200 250 300 350 400 450…

Big Ideas Math A Bridge To Success Algebra 1: Student Edition 2015

1st Edition

ISBN:9781680331141

Author:HOUGHTON MIFFLIN HARCOURT

Publisher:HOUGHTON MIFFLIN HARCOURT

Chapter1: Solving Linear Equations

Section1.5: Rewriting Equations And Formula

Problem 50E

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Topic Video

Question

Tablet computers In October 2011, cnet.com listed the
battery life (in hours) and luminous intensity (i.e., screen
brightness, in cd>m2

) for a sample of tablet computers.
We want to know if brighter screens drain the battery
more quickly.
Dependent variable is Video battery life (in hours)
R-squared = 27.9%
s = 1.913 with 23 - 2 = 21 degrees of freedom
Variable Coefficient SE(Coeff) t-Ratio P-Value
Intercept 2.8467073 1.6628386 1.7119566 0.10163
Brightness 0.014080549 0.0049373503 2.851843 0.00955a) How many tablet computers were tested?
b) Are the conditions for inference satisfied? Explain.
c) Is there evidence of an association between maximum
brightness of the screen and battery life? Test an
appropriate hypothesis and state your conclusion.
d) Is the association strong? Explain.
e) What is the equation of the regression line?
f) Create a 90% confidence interval for the slope of the
true line.
g) Interpret your interval in this context.

12
10 +
4+
150
200 250
300
350 400
450
Maximum Brightness (in cd/m?)
-4 +
6
7
8.
Predicted (video battery life)
Residuals (video battery life)
Video Battery Life (in hours)
2.

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