In your journal, hopefully you came up with something like:
If I plant sunflower seeds in different soil types, then the sunflower plants will grow the tallest in the composted soil.
Sometimes scientists make a hypothesis and after they do their experiment, they prove their hypothesis is supported by evidence. But did you know that sometimes a hypothesis is proven false or rejected?
A hypothesis is an educated prediction on what you think will happen. Only your experiment will show if your hypothesis is supported or rejected.
That’s part of the fun of being a scientist. Sometimes your hypothesis is supported by your experiment and sometimes it’s rejected. Either way, the data collected from your experiment will help you answer your question.
For example, let’s say Sally predicts that the compost soil type will grow the tallest plants.
After she conducts her experiment, she finds that a different soil type is better for growing tall sunflowers. Her hypothesis was rejected. That’s important to know because Sally will have discovered what is the best soil for her sunflowers.
So if your experiment yields a different result than what you predicted in your hypothesis, don’t fret. That’s important to know too!