Question: Scores on a test are normally distributed with a mean of 65 and standard deviation of 15 (population parameters). A researcher wants to know if

Scores on a test are normally distributed with a mean of 65 and standard deviation of 15 (population parameters). A researcher wants to know if a supplement will cause a change in scores. A sample of n=25 is selected and given the supplement. Following the treatment, the average score for the sample is m=70. Is there evidence of a treatment effect?

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