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13 measured data points have a sample mean of 6.32 and a standard deviation of 1.45....

13 measured data points have a sample mean of 6.32 and a standard deviation of 1.45. Estimate the range of values for which you would expect 90% of all future measurements to fall (or for a single future measurement to fall within 90% probability). Find a, where the data is expected to fall ±a about the sample mean.

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