You use a line of best fit for a set of data to make a prediction about an unknown value. Which correlation coefficient, r, would reflect a situation in which you would NOT be confident at all that the predicted value will be reasonably close to the actual value?

Anew obstacle course is home to several new types of challenging obstacles. one such obstacle is traversing a 15-stair staircase. to make it more challenging, the stairs are not uniformly spaced. rather, the vertical space between consecutive stairs for the first 10 stairs is 113 feet and the vertical space for the last 5 stairs is 134 feet. what is the total vertical distance traveled ascending and descending the entire 15-stair staircase?