Tablet computers In October 2011, cnet.com listed the battery life (in hours) and
Chapter 26, Problem 43(choose chapter or problem)
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 0.00955 a) 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.
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