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Historically, the length of human pregnancies has been normally distributed, with a standard deviation of =8.8days. A random sample of n=10women was collected. The sample

Historically, the length of human pregnancies has been normally distributed, with a standard deviation of =8.8days. A random sample of n=10women was collected. The sample mean duration of their pregnancies was x=279.1

days. Please use this information to calculate a 90% confidence interval for the true mean length of human pregnancies.

Input the lower and upper bounds.

Lower bound ______

Upper bound ______

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