Hours 4 3 2 1 -1 10 20 30 40 50 60 70 80 90 100 110 Brightness Level a) Find the equation for the line of best fit. Keep at least 4 decimals for each parameter in the equation. $\hat{y}$ $\hat{y}$ = 6.99454 - 0.05121$x$ b) Interpret the slope in context. Cornell should expect -0.0512 hours per brightness level. Cornell should expect -0.0512 brightness level per hour. c) What does the equation predict for the number of hours the phone will last at a brightness level of 36? 5.151 hours d) What is the residual for the point (36, 6.9)? 1.749 hours e) Find the 99% prediction interval for the number of hours the phone will last at a brightness level of 36. < y < hours Question Help: Video
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a) Find the equation for the line of best fit. Keep at least 4 decimals for each parameter in the equation. b) Interpret the slope in context. Ken should expect -0.052 brightness level per hour. Ken should expect -0.052 hours per brightness level. c) What does the equation predict for the number of hours the phone will last at a brightness level of 75? Check Answer
Sri K.
Jordan 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) 33 42 43 47 74 75 79 97 Hours (y) 4.5 4 6.3 6.4 2.7 1.6 2.9 1.5 a) Find the equation for the line of best fit. Keep at least 4 decimals for each parameter in the equation. b) Interpret the slope in context. - Jordan should expect -0.0682 brightness level per hour. - Jordan should expect -0.0682 hours per brightness level. c) What does the equation predict for the number of hours the phone will last at a brightness level of 47? d) What is the residual for the point (47,6.4)?
Adi S.
Ben 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) 17 46 61 70 71 74 87 94 Hours (y) 5.4 4.2 4.5 2 4.3 4.4 3.6 2.7 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. Ben should expect -0.0299 hours per brightness level. Ben should expect -0.0299 brightness level per hour. c) What does the equation predict for the number of hours the phone will last at a brightness level of 74? hours d) Calculate the correlation coefficient r.
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