CJUS-K300 1nd Edition Lecture 9Outline of Last Lecture I. Z-Score Outline of Current Lecture I. Confidence Intervals pt. 1 Large SamplesII. Central Limit TheoremCurrent LectureCentral Limit Theorem:1. The means from a large number of samples (all of size n ≥ 100) will always form a normaldistribution. 2. μx = μ meaning if μx = 5 then μ = 5σX = Standard error of the distribution of a large number of sample means taken from the same populationConfidence Interval Formula x 1±z_α (s/√(n-1) Alpha levels (how likely it is that you are wrong)For a 99% - a=.01For a 95% - a=.05For 90%- a=.10Example: x 1±z_α (s/√(n-1))Calculate a 95% confidence interval:5.5±1.96(2.5/√(100-1)) = 5.5 +.49These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.We are 95% confident that the actual population mean attitude toward gun control is between 5.01 points and 5.99 points on the Gun Control Attitude
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