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Mathematics, 25.11.2019 22:31 Hfruit

Aresearcher selected a sample of 56 former student leaders from a list of graduates of a large university. she discovered that it had taken an average of 4.97 years for these graduates to finish their degrees, with a standard deviation of 1.23. the average for the entire student body is 4.56 years. is the difference statistically significant at 95% confidence level?

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