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Performing Round Robin for tensile testing (required for Nadcap cert)

I have 3 operators. Each one processed 4 tests.

Population 12

Level of confidence required is 95%

Standard deviation (for tensile values only) is 0.51.

Required tensile range (for acceptance) is 280-300 ksi. All results were in the upper range - lowest 295.7, highest 297.4.

Average: 296.67

Calculating level of confidence using "confidence" function in Excel is giving me a result of 0.289.

How do I interpret this?

Detailed explanations would be very, very appreciated.

I have 3 operators. Each one processed 4 tests.

Population 12

Level of confidence required is 95%

Standard deviation (for tensile values only) is 0.51.

Required tensile range (for acceptance) is 280-300 ksi. All results were in the upper range - lowest 295.7, highest 297.4.

Average: 296.67

Calculating level of confidence using "confidence" function in Excel is giving me a result of 0.289.

How do I interpret this?

Detailed explanations would be very, very appreciated.

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