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The following measurements (in picocuries per liter) were recorded by a set of hydrogen gas detectors installed in a research facility:1, 699.2,...

Needing help with the second part of this question and calculating the sample standard deviation. Screen Shot 2019-05-04 at 7.22.50 PM.png

Screen Shot 2019-05-04 at 7.22.50 PM.png

The following measurements (in picocuries per liter) were recorded by a set of hydrogen gas detectors installed in a research facility:
689.1, 699.2, 707.8, 729.8 Using these measurements, construct a 99 % confidence interval for the mean level of hydrogen gas present in the facility. Assume the population is approximately
normal. Copy Data l Step 2 of4: Calculate the sample standard deviation for the given sample data. Round your answer to two decimal places.

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