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Example of two tailed test

Provide an example of a situation from your personal or professional experience where an two-sample test of hypothesis of dependent samples would be useful in a decision-making process. How would the hypothesis statement read?

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A high school maths teacher wants to asses a student learning. Twelve students were given a math test on first day of the semester and their scores are recorded. The students were given an equivalent ...

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Example of real life situation where two tailed test is used.