Sofia and Amir could not reach a high shelf. Design A was a 3-inch box. Design B was a 6-inch box. They tested both by standing on each box and measuring how high they could reach. They wrote the numbers in inches. Results: A reached 48 inches, B reached 51 inches. Which data was collected from the tests?
- They measured how high they could reach on each box. (correct answer)
- They counted how many crayons were in the room.
- They said which box was their favorite color.
- They used a different ruler for each box.
Explanation: This question tests the 1st grade skill of collecting data from tests of two objects designed to solve the same problem (K-2-ETS1-3: Analyze data from tests of two objects). When we have two different designs that try to solve the same problem, we test them both to collect data (information) about how well each one works. Fair testing means doing the same test to both designs under the same conditions (same number of items, same amount of force, same distance, same measurement method). Data is the information we collect from testing - it can be numbers we count (how many books fell?), measurements (how high can we reach?), observations we make (did it tip over - yes or no?), or comparisons (which held more?). We record this data so we can look at it and compare the two designs. Testing and collecting data gives us evidence about how each design performs, which helps us decide which design works better for solving the problem. In this scenario, the problem was can't reach shelf. Two designs were created: Design A was a 3-inch box and Design B was a 6-inch box. They tested both designs by standing on each box and measuring how high they could reach. They collected data showing Design A - reached 48 inches, Design B - reached 51 inches. Choice A is correct because it accurately identifies data collected: states specific measurements from both designs; describes fair testing: explains same procedure used for both. For example, they measured how high they could reach using each platform, giving comparison data (48 inches vs 51 inches); they tested both by standing on each and measuring with the same method, making it fair. Choice C represents error type: subjective only. This error typically occurs when students think testing is just trying it once without recording data, focus on appearance instead of performance data, skip data collection and jump to conclusions. To help students understand testing and data collection: Actually test two designs side by side with students watching; explicitly state 'this is the data we're collecting' (how many, how much, yes/no, measurements); use simple data tables showing Design A results and Design B results; emphasize fair testing (same test for both - if we put 3 books on A, we put 3 books on B too); record data as you collect it (write numbers, make tallies, check yes/no); distinguish between building designs and testing designs (two separate steps). Watch for: students who think testing means just trying it once without recording anything, who don't see why same test matters, who confuse materials with data, who describe process but not results, who want to jump to 'which is better' before collecting data, or who think watching is the same as recording data. Key concepts: (1) test both designs same way (fair), (2) collect specific data (numbers, measurements, observations), (3) record data so you can compare, (4) data = evidence about how designs perform.