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A study investigated the 2D:4D ratio in women of European descent at a large college. A...

A study investigated the 2D:4D ratio in women of European descent at a large college. A sample of 135 women yielded an average 2D:4D ratio of 0.988. Suppose it is known that the standard deviation of the ratio is 0.028. What is a 90% confidence interval for the population mean? What is a 98% confidence interval of the population mean? Which one is wider?

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