Step 1 :Given that the sample mean (\(\bar{x}\)) is 138.8, the standard deviation (\(\sigma\)) is 44.7, and the sample size (\(n\)) is 30.
Step 2 :The formula for the confidence interval is \(\bar{x} \pm Z \frac{\sigma}{\sqrt{n}}\), where \(Z\) is the Z-score corresponding to the desired confidence level.
Step 3 :The Z-scores for 90%, 95%, and 99% confidence levels are approximately 1.645, 1.96, and 2.576 respectively.
Step 4 :For a 90% confidence level, the lower limit is \(\bar{x} - Z \frac{\sigma}{\sqrt{n}} = 138.8 - 1.645 \frac{44.7}{\sqrt{30}}\), the upper limit is \(\bar{x} + Z \frac{\sigma}{\sqrt{n}} = 138.8 + 1.645 \frac{44.7}{\sqrt{30}}\), and the margin of error is \(Z \frac{\sigma}{\sqrt{n}} = 1.645 \frac{44.7}{\sqrt{30}}\). After calculation, the lower limit is \(\boxed{130.6}\), the upper limit is \(\boxed{147.0}\), and the margin of error is \(\boxed{8.2}\).
Step 5 :For a 95% confidence level, the lower limit is \(\bar{x} - Z \frac{\sigma}{\sqrt{n}} = 138.8 - 1.96 \frac{44.7}{\sqrt{30}}\), the upper limit is \(\bar{x} + Z \frac{\sigma}{\sqrt{n}} = 138.8 + 1.96 \frac{44.7}{\sqrt{30}}\), and the margin of error is \(Z \frac{\sigma}{\sqrt{n}} = 1.96 \frac{44.7}{\sqrt{30}}\). After calculation, the lower limit is \(\boxed{128.8}\), the upper limit is \(\boxed{148.8}\), and the margin of error is \(\boxed{10.0}\).
Step 6 :For a 99% confidence level, the lower limit is \(\bar{x} - Z \frac{\sigma}{\sqrt{n}} = 138.8 - 2.576 \frac{44.7}{\sqrt{30}}\), the upper limit is \(\bar{x} + Z \frac{\sigma}{\sqrt{n}} = 138.8 + 2.576 \frac{44.7}{\sqrt{30}}\), and the margin of error is \(Z \frac{\sigma}{\sqrt{n}} = 2.576 \frac{44.7}{\sqrt{30}}\). After calculation, the lower limit is \(\boxed{125.3}\), the upper limit is \(\boxed{152.3}\), and the margin of error is \(\boxed{13.5}\).