(Solved by Humans)-According to the past 5 years of experience, a professor knows
Question
According to the past 5 years of experience, a professor knows that the average hours his students spend on the final project is 15 (standard error of the mean = 0.9).? In order to see whether or not the time his students spend on the project has decreased this semester, he randomly sampled 50 of his students and calculated the average hours as 14.
- Calculate the z-statistic.
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