Spreadsheet software like Microsoft Excel, as noted in the Using Technology with Classroom Instruction that Works, provide students with tools to test their hypotheses through entering data and using various functions such as graphing, to see the results. For first grade, we use the National Library of Virtual Manipulatives (http://nlvm.usu.edu/) to make graphs individually or on the Smartboard to test hypotheses. We start with general questions, like what is your favorite special (P.E., Art, etc.) and then move into using the graphs to test hypotheses like "A coin will land on heads and tails about the same number of times".
Other data collection tools help students amass data in an organized way so that they can analyze it sensibly and accurately. As the authors of Using Technology... note, it is important to provide students with examples and guidance in the different ways they can go about proving or disproving a hypothesis. I think it is important to note that students should not be discouraged from pursuing a hypothesis because the teacher knows it will be disproved. Sometimes finding out why something won't work is just as important as why it would work.
Web resources seem to abound for more advanced subjects like DNA and American History. However, for first graders, the best resource I have found is actually a Webkinz toy. A Webkinnz is a stuffed animal that comes with a passcode to the Webkinz website where a computer version of the toy lives. In first grade we learn about wants, needs, and what living things need to survive. Having that silly Webkinz was a great way to teach the children problem solving skills as well. They had to buy food for it so they could choose to play a game (there were several great math and problem solving games), or go searching for a gem in a mine that they could sell. They had to choose to buy it food instead of a fancy toy.
There was one problem solving game that was great. It was called "Home Before Dark". In the game, there was a map with the park along one side, and homes along the other. There were squares in the middle that had path sections, and student had to rotate the paths to get the pets home. At first, the students were just wildly tapping, thier internal hypothesis being, "If I hit as many as I can, eventually it will work". It didn't work. They started yelling at each other to stop tapping the squares and look at the paths. I would like to find more resources like this that involve our curriculum as well.
Resources:
Lever-Duffy, J. & McDonald, J. (2008). Theoretical Foundations (Laureate Education, Inc., custom ed.). Boston, MA: Pearson Education, Inc.
Pitler, H., Hubbell, E., Kuhn, M., & Malenoski, K. (2007). Using technology with classroom instruction that works. Alexandria, VA:
Pitler, H., Hubbell, E., Kuhn, M., & Malenoski, K. (2007). Using technology with classroom instruction that works. Alexandria, VA: