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. . To test claims about inferences for two proportions, under specific conditions. 8.4: two-proportion inference tests. Proportions observed in independent random samples . are. independent. Thus, we can add their variances. So…. . based on a sample of size . n. is 410 . .  20. . . true. . or . false. …..?. . is definitely between 390 and 430.. The statement is false. It’s quite plausible that . μ. is in this interval, but there is no guarantee.. Chapter 19 Rocks!. Formulaic Consequences. In our formula, . fractionwise. , z-star is in the top and n is in the bottom.. The terms for these are directly proportional (for z-star) and inversely proportional (for n).. Excel. GrowingKnowing.com © 2011. 1. GrowingKnowing.com © 2011. Estimates. We are often asked to predict the future!. When will you complete your team project?. When will you make your first million dollars?. GrowingKnowing.com © 2011. 1. GrowingKnowing.com © 2011. Estimates. We are often asked to predict the future!. When will you complete your team project?. When will you make your first million dollars?. 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 . GrowingKnowing.com © 2011. 1. GrowingKnowing.com © 2011. Estimates. We are often asked to predict the future!. When will you complete your team project?. When will you make your first million dollars?. John Krickl. Glenbrook North High School. Northbrook, IL. jkrickl@glenbrook225.org. DUALITY STICKS. Motivation. “. Using the same sample, a two-tailed hypothesis test with significance level α will . 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 . for . a population proportion.. Do Now:. A confidence interval is centered around a:. I. Parameter. II. Statistic. III. Measure of Variance.. (A) I only (D) I and II only. Proportion – Learning Outcomes Express quantities as proportions of each other using fractions, decimals, ratios, and percentages. Divide quantities into a given proportion. Express errors as a proportion. Chapter 6 Confidence Intervals Sections 6-1 and 6-2 Confidence Intervals for Large and Small Samples   VOCABULARY: Point Estimate – A single value estimate for a population parameter. Confidence Intervals for a Population Proportion Section 8.3 Objectives Construct a confidence interval for a population proportion Find the sample size necessary to obtain a confidence interval of a given width Martijn Schuemie, PhD. Janssen Research and Development. Previous meetings. Oct 19: Sequence Symmetry Analysis. Nov 2: Distributed regression & bio-signal collection. Nov 16: Propensity score lessons learned.