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Your problem is that your friend routinely misses the school bus:
What are the causes for his missing the school bus:
Not waking early enough
Too long breakfast
Too far to the bus stop
Deliberately tries to miss the bus.
Choose one cause as a hypothesis: In this case we'll say "Not waking early enough."
We develop a test, for this hypothesis: calling his phone when you wake up. (for example).
We conduct the experiment and document the results: Though the friend is grumpy, he does start making it to the bus stop on time.
We make a conclusion based on the results: our friend needs to wake up earlier.
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