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A <em>hypothesis</em> is an initial proposal that is tentative, whereas a <em>theory</em> is a proposal that has been tested extensively.
Explanation:
A hypothesis is defined as a supposition or proposed explanation made based on evidence to make further investigation. And a theory is something based on ideas to explain other things or general principles where the practice is an essential key for investigation success.
They decided they needed a railroad to be more efficient and to be able to compete with the states around them that already had the railroad.
Any negative value will produce this graph