Thanks for this lesson idea. I also teach sophomores and juniors and am always looking for more ways to prepare them for the MME as schools are so focused on the results. I like that the students are making their own graphs and ask to come up with conclusions about the data.
One suggestion I would make is to have groups do different sets of data and have each group come up with questions that relate to their graph. One the students share their graphs and data, the other groups can answer the questions. This way all groups are not only practice analzying data, but also answering quetisons on data they are just seeing,
Reading through this lesson it looks like this would all flow very smoothly with the technology. Another thing you could do in addition to this lesson is to then have students collect data using a temperature or pH probe and practice collecting data using another form of technology.