The following measurements (in picocuries per liter) were recorded by a set of h

Question

The following measurements (in picocuries per liter) were recorded by a set of helium gas detectors installed in a manufacturing facility: 851.3, 857.2, 908.1, 862.9 Using these measurements, construct a 95 % confidence interval for the mean level of helium gas present in the facility. Assume the population is approximately normal Copy Data Step 4 of 4: Construct the 95 % confidence interval. Round your answer to two decimal places. Answer(How to Enter) 2 Points Keypad Lower endpoint: Upper endpoint:

Explanation / Answer

The statistical software output for this problem is:

One sample T confidence interval:
: Mean of variable

95% confidence interval results:

Hence,

Lower endpoint = 828.63

Upper endpoint = 911.12

Variable Sample Mean Std. Err. DF L. Limit U. Limit Data 869.875 12.959834 3 828.63102 911.11898

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