QMS 202 Study Guide - Midterm Guide: Railways Act 1921, Random Variable, Null Hypothesis

• School: Ryerson University
• Department: Quantitative Methods
• Course: QMS 202
• Professor: Clare Chua- Chow

Document Summary

Confidence interval: (intr) the true difference in means falls inbetween the confidence interval. 2-sample z interval - calculates the confidence interval for the difference between two population means when the population standard deviations of two samples are known. 2-prop z interval - calculates the confidence interval for the difference between the proportion of successes in two populations. 2-sample t interval - calculates the confidence interval for the difference between two population means when both population standard deviations are unknown. C-level: confidence interval = 1 x1: mean of sample 1. Critical value: (dist) stat value ----------------- critical z value = stat dist norm invn ------ z value = + and - Right: right end of interval df: degree of freedom x1: mean of sample 1 x2: mean of sample 2 sx1: Area: 1 level of significance for right or left tail test and for two tail test 1 level of significance/2 df: n 1 (n = sample size)