In a test to check pH level, 49 samples showed its level to be 2.4 and with a standard deviation of 0.35.  Find the 90% confidence interval estimate for the mean pH level.   2.4±0.352.4±0.35 2.4±0.082.4±0.08 2.4±0.0982.4±0.098 2.4±0.322.4±0.32 2.4±0.01

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