Twenty-five wooden beams were ordered for a construction project. The sample mean and the sample standard deviation were measured: = 320 cm, s = 8 cm. Calculated confidence interval for the mean is [316.70; 323.30]. Which confidence level was chosen? Assume distribution to be normal. 99.9% O 90% O 95% O 99%

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Twenty-five wooden beams were ordered for a construction project. The sample mean and the sample standard deviation were
measured: x = 320 cm, s = 8 cm. Calculated confidence interval for the mean is [316.70; 323.30].
Which confidence level was chosen? Assume distribution to be normal.
O 99.9%
O 90%
O 95%
○ 99%
Transcribed Image Text:Twenty-five wooden beams were ordered for a construction project. The sample mean and the sample standard deviation were measured: x = 320 cm, s = 8 cm. Calculated confidence interval for the mean is [316.70; 323.30]. Which confidence level was chosen? Assume distribution to be normal. O 99.9% O 90% O 95% ○ 99%
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