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Nathan is investigating how long his phone s battery lasts in hours for various brightness...

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Nathan 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 20 9 2 Hours 7 6 Brightness Level x 27 O 45 69 71 72 80 Hours y 6 5 3 5 2 5 3 3 6 1 9 1 30 30 30 40 50 60 70 80 90 100 110 Brightness Level Calculate the correlation coefficient Round accurately to at least three decimals Use the correlation coefficient to describe the strength and direction

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