Shooting the Poop CER Adapted from NSTA V Question Why do caterpillars fling their frass Experimental design Caterpillars were raised in individual containers where they could build shelters One had a clean treatment where frass caterpillar poop was removed daily from the container The other had a frassy treatment which allowed frass to accumulate in the container throughout development She measured the mass of 61 caterpillars in Year 1 30 in each treatment and 50 caterpillars in Year 2 25 in each treatment Average Caterpillar Mass 1000 750 500 250 0 15 5 Year 1 frassy clean 11 15 2 What is the independent variable 11 What is the dependent variable 20 25 H1 1 What CLAIM can be made from the collected data Year 2 frassy clean Pupae Caterpillar Age 3 Summarize the EVIDENCE that supports the claim 5 11 15 20 HA ll 25 31 Pupae HA