Cnet.com tests tablet computers and continuously updates its list. As of January 2014, the list included the battery life (in hours) and luminous intensity (i.e., screen brightness, in cd/m2). We want to know if brighter screens are related to the maximum Screen Brightness, (http://reviews.cnet.com/8301-19736_7-20080768-251/cnet-updates-tablet-test-results/?tag =contentBody ; contentHighlights)
Response variable is Battery life (hrs)
R-squared = 11.3%
s = 2.128 with 34 - 2 = 32 degrees of freedom

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