Confidence Interval estimation 置信区间估计 Provides range of values n Based on Observations from 1 Sample Gives Information about closeness to Unknown Population Parameter Stated in terms of Probability Never 100%o sure• Provides Range of Values  Based on Observations from 1 Sample • Gives Information about Closeness to Unknown Population Parameter • Stated in terms of Probability Never 100% Sure Confidence Interval Estimation 置信区间估计