Posted by **Dawn** on Saturday, August 21, 2010 at 6:18am.

63.4 65.0 64.4 63.3 54.8 64.5 60.8 49.1 51.0

Assume that these observations are an SRS from the late Cretaceous atmosphere. What is the mean percent of nitrogen in ancient air with a 90% confidence level?

Hint: uses one-sample t confidence

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