The hypothesis was rejected. It would be expected that 7-up will produce the largest sugar crystal formation on the bamboo skewer. However, unsweetened apple juice had the biggest crystal on the bamboo skewer. This was assessed by measuring the mass of each crystal, using an electronic balance (quantitative measurements) and qualitative observations (in the form of anecdotal notes).
What might have gone wrong? The position of the jars in the dinning room, allowed the unsweetened apple juice to gain a little bit more sunlight than the other two. The unsweetened apple juice might have evaporated more, thus causing larger sugar crystals. Also, next time, I would mass each bamboo skewer prior to doing the experiment. This would help in getting an accurate mass of each sugar crystal.
Was there an error in your work that you could fix for next time? Yes, I would position the all three jars so that they get equal amount of sunlight. Also, I would mass each bamboo skewer prior to doing the experiment.
If your hypothesis is not supported, what did you learn instead? Unsweetened apple juice can form the biggest sugar crystals in a short period of time (two weeks).
How does your new learning fit with your background reading? It is possible to form sugar crystals in other liquids like 7 Up and unsweetened apple juice, not just water.