Question 12 0/4 pts 9 10 = 4 0 Details Before you attempt this question, on your graphing calculator hit MODE and turn STATDIAGNOSTICS on! (Or hit 2nd-0 and find DiagnosticOn in the catalog.) Quinn is investigating how long his phone's battery lasts (in hours) for various brightness levels (on a scale of 0-100). His data is displayed in the table and graph below. Brightness Level (x) 35 53 57 60 67 87 99 99 Hours (y) 5.5 4.2 4.9 4.1 4.9 1.3 3 1.3 8- un Hours 10 20 30 40 50 60 70 80 90 100 11 Brightness Level a) Find the equation for the line of best fit. Keep at least 4 decimals for each parameter in the equation. (You should begin by typing y=) b) Interpret the slope in context. Quinn should expect -0.06 brightness level per hour. O Quinn should expect -0.06 hours per brightness level. c) What does the equation predict for the number of hours the phone will last at a brightness level of 99? hours d) Calculate the correlation coefficient r