The most plausible causes of the error in the results of a computational model from the options provided are:
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The computer didn't follow the equation correctly. - This suggests a potential issue in the implementation of the model or how the computer interpreted the equation, which can lead to computational errors.
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It was human error, an incorrect equation was inputted. - This highlights the possibility that the model was set up incorrectly due to mistakes made by the user, such as a typo or misunderstanding of the equations involved.
The statements regarding "Some types of equations can only be calculated by humans" and "It could not have been caused by an incorrect equation because computational models fix such errors automatically" are generally inaccurate. Many equations can be computed accurately by computers if implemented correctly, and while some errors can be mitigated, computational models do not automatically fix all types of errors, especially incorrect input from users.