___._.__.__.. I.._a._.... ._ .___......_.._.__.. PC Magazine provided ratings for several characteristics of computer monitors, including an overall rating.'l' The following data show the rating for contrast ratio, resolution, and the overall rating for ten monitors tested using a 0100 point scale. The highest rated monitor was the BenQ BL3201PH, with an overall rating of 87. Contrast Resolution Overall Ratio Rating BenQ BL3201PH 78 89 87 l ADC U2868PQU l 87 86 98 l NEC MultlSynC PA322UHD 84 82 85 56 77 47 55 Dell UltraSharp U22715H 83 81 NEC MultiSync EA244UH D 75 79 HP DreamColor 227x 81 77 70 76 Dell UltraSharp U22315H (a) Develop the estimated regression equation that can be used to predict the overall rating using the contrast ratio rating. (Round your numerical values to two decimal places. Let X1 represent the contrast ratio rating and 3/ represent the overall rating.) 9 = l l (b) Develop the estimated regression equation that can be used to predict the overall rating using both the contrast ratio rating and the resolution rating. (Round your numerical values to two decimal places. Let X1 represent the contrast ratio rating, X2 represent the resolution rating, and 1/ represent the overall rating.) 9=l l (c) Predict the overall rating for a computer monitor computer that has a contrast ratio rating of 84 and a resolution rating of 72. (Round your answer to the nearest integer.) l l