In 2014, cnet.com listed the battery life (in hours) and maximum luminous intensity (i.e., screen brightness, in cd>m2) for a sample of tablet computers. We want to know if we can predict battery life from the maximum brightness. (reviews.cnet.com/8301-19736_7-20080768-251/cnet-updates-tablet-testresults/? tag=contentBody; contentHighlights)

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 95% confidence interval for the slope of the true line.

g) Interpret your interval in this context.

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14+ 12+ 10 4 + 200 300 400 500 600 700 Maximum Brightness (in cd/m?) 2 -4 + 8 10 11 Predicted Battery Life Residuals Battery Life (in hr) 642 O