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A scientist is studying the mean den time of Brown bears. She takes a random sample of 34 and gets a mean of 68 days.

A scientist is studying the mean den time of Brown bears. She takes a random sample of 34 and gets a mean of 68 days. The population standard deviation is 17.6 days. She believes that the length of den time has decreased, and is less than 72 days. Compute the test statistic for this problem.

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