Quick Start Expectations 1.Fill in planner and HWRS HW: p. 96, #1-3, 14 (ACE #3 WS) 2.Get a signature on HWRS 3.On desk: calculator, journal, HWRS, pencil, pen 4.Warm Up: next slide… back of HWRS

Warm Up Suppose two sisters live 240 miles apart. One sister has three young children who are planning to visit their aunt for a week. To prevent driving so far, the sisters agree to leave at the same time, drive toward each other, and meet somewhere along the route. The sister with the three children tends to drive carefully and obey the speed limit. Her average rate of speed is 70 mph. The other sister drives too fast, and her average rate of speed is 80 mph. How long will it take the two sisters to meet each other to transfer the children? First, notice that two cars are traveling toward each other. Their average rates of speed are given. The total distance is given, and, even though we do not know the time the cars began to travel, we are told that the two cars did leave home at the same time. Therefore, it will take 1 hour and 36 minutes for them to meet.

There is a general linear trend. “How close is good enough?”

s = h The line passes through (57, 57), (60, 60), (62, 62) and (67, 67). Arm span and height are equal in the points. Points above the line indicate arm span is greater than height; points below the line indicate arm span is less than height.

Robert Wadlow’s data point should lie above the modeling line, indicating his arm span was greater than his height. His data point does not precisely support the claim, but both of his measures are quite large for human beings!

The model consistently overestimates arm span from height. The residuals are small. You might argue that you can’t predict arm span exactly from height, but you can get close!

No! arm span and height are not equal. T. rex’s data point would be below the s = h line.