Is a system used for reducing bias and error in the measurement of data.

The scientific method is a system used for reducing bias and error in the measurement of data. When you start with the scientific method you ask question such as: who, what, wear, when, why, how. After asking questions you will research, develop a hypothesis, test your hypothesis, analyze your findings and then share your results. This method will help prove your hypothesis true or false and thus reduce bias and error. 

The answer is one year.

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