01:960:285 Lecture Notes - Lecture 17: Confidence Interval, Standard Deviation, Sampling Distribution

• School: Rutgers University
• Department: Statistics and Biostatistic
• Course: 01:960:285
• Professor: Zhanyun Zhao

Document Summary

Stat 285-lecture 17-confidence interval for the population mean and proportion: confidence intervals, note that z alpha/2 is the z-score required to attain a certain confidence level. For example, for a confidence level of 95%, alpha is 1- 0. 95, and alpha/2. The degrees of freedom is n-1 freedom: http://www. stat. tamu. edu/~lzhou/stat302/t-table. pdf. The critical value is the difference from the mean for the upper and lower bounds: example 1: The variable is the amount of money owed by delinquent debtors: random sample of 100 debtors, mean of 230. Plug values into equation for interval: evaluate, example 1 cont: Take the following information for the sample of debtors: get the 99% confidence interval. The standard error of the mean is multiplied by the z-alpha/2 to get the distance from the mean for the confidence interval: example 2: There are six patients for which blood pressure is being measured.