PPT-MATH 2311 Section 7.3 Confidence Interval for the Difference of Two Proportions

This would involve the percent of difference between two groups For example you want to determine the difference in success rates between students from highincome families versus students with lowincome families. Basic understanding of P values and Confidence limits. CHE Level 5. March 2014. Sian Moss. valuable for . quantifying. the effectiveness of a particular intervention, relative to some comparison. It allows us to move beyond the simplistic, 'Does it work or not?' to the far more sophisticated, . Recitation 12. (4/2/2013). TA: Zhen Zhang. zhangz19@stt.msu.edu. Office hour: (C500 WH) 3-4 PM Tuesday. (. office . tel.: . 432-3342). Help-room: (A102 WH) . 9:00AM-1:00PM. , . Monday. Class meet on Tuesday: . two-proportion inference tests. Chapter 22. Proportions observed in independent random samples . are. independent. Thus, we can add their variances. So…. The standard deviation of the difference between two sample proportions is . Difference Between Proportions. Sometimes we want to see if there is a significant difference between independent groups.. Control group vs. treatment group or placebo group. Men vs. women. Last year vs. this year. Brianna Kurtz. Associate Professor of Mathematics and Statistics. Daytona State College. Daytona Beach, FL. General Purpose. Have students analyze data and be able to locate appropriate values (without being handed a clean data set). Section 8.1. Confidence Intervals: The Basics. After this section, you should be able to…. INTERPRET a confidence level. INTERPRET a confidence interval in context. DESCRIBE how a confidence interval gives a range of plausible values for the parameter. Recitation 14. (12/4/2012). TA: Zhen . (Alan) . Zhang. zhangz19@stt.msu.edu. Office hour: (C500 WH) 1:45 – 2:45PM . Tuesday. (office . tel.: . 432-3342). Help-room: (A102 WH) 11:20AM-12:30PM, . Monday, Friday. Day 19. A new example, with less information:. Now I want to know about the average height of three year old apple trees. A random sample of 60 trees gave us a standard deviation of 2.8 inches (so we’ll assume . Recitation 14. (12/4/2012). TA: Zhen . (Alan) . Zhang. zhangz19@stt.msu.edu. Office hour: (C500 WH) 1:45 – 2:45PM . Tuesday. (office . tel.: . 432-3342). Help-room: (A102 WH) 11:20AM-12:30PM, . Monday, Friday. Recitation 13. (11/27/2012). TA: Zhen . (Alan) . Zhang. zhangz19@stt.msu.edu. Office hour: (C500 WH) 1:45 – 2:45PM . Tuesday. (office . tel.: . 432-3342). Help-room: (A102 WH) 11:20AM-12:30PM, . Monday, Friday. Week 10 Chapter 16. Confidence Intervals for Proportions 1 Point and Interval Estimation A point estimate, for example, estimated mean or estimated proportion, is a single number that is the best value for the parameter (e.g., population mean, or population proportion). Chapter 8: Inference for Proportions Lecture Presentation Slides Macmillan Learning © 2017 Chapter 8 Inference for Proportions 8.1 Inference for a Single Proportion 8.2 Comparing Two Proportions MATH 2311 Section 7.4 Confidence Interval for a Population Mean So, what is t* ? How do we find critical values for a t -distribution? Look at the online text book, under appendices. Degrees of freedom are on the left and the top end (1-confidence level/2) are given at the top. Special Topics. A 95% Confidence Interval. Now, in plain English…. What this is saying is that a 95% confidence interval is an interval created to estimate what (where) the true parameter might be..