Confidence Interval Calculator

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Sample Mean:

Standard Deviation:

Sample Size:

Confidence Level: 80% 85% 90% 95% 98% 99% 99.5% 99.9%

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Results

95% Confidence Interval

9.3054 to 11.0946

Margin of Error: ±0.8946

Standard Error

0.4564

Z-Score

1.96

Mean

10.2

Sample Size

30

Std Dev

2.5