Roy 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) Hours (y) 26 5.9 52 54 4.6 65 2.3 77 2.5 95 -7- -2 I0 20 30 40 so 60 70 NO 90 1007 Brightners tavet Use technology (like Google Sheets) to calculate r, the correlation coefficient. Round to two places after the decimal. Based on the correlation coefficient, describe the strength and direction of the association. a) In general, what is the relationship between brightness level and battery life? b) How strong is this effect? c) Does this relationship between brightness level and battery life make sense to you? Explain.
Roy 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) Hours (y) 26 5.9 52 54 4.6 65 2.3 77 2.5 95 -7- -2 I0 20 30 40 so 60 70 NO 90 1007 Brightners tavet Use technology (like Google Sheets) to calculate r, the correlation coefficient. Round to two places after the decimal. Based on the correlation coefficient, describe the strength and direction of the association. a) In general, what is the relationship between brightness level and battery life? b) How strong is this effect? c) Does this relationship between brightness level and battery life make sense to you? Explain.
Chapter4: Linear Functions
Section: Chapter Questions
Problem 30PT: For the following exercises, use Table 4 which shows the percent of unemployed persons 25 years or...
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