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Unit 4 lesson 1
 

Unit 4 lesson 1

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    Unit 4 lesson 1 Unit 4 lesson 1 Presentation Transcript

    • Unit 4: Statistical Significance Lesson 1: Constructing Confidence Intervals EDER 6010: Statistics for Educational Research Dr. J. Kyle Roberts University of North Texas Next Slide
    • Mean Differences IQ Scores Next Slide 100 115 85
    • Standard Error of the Mean Sample of IQ Scores Mean = 100 SD = 15 N = 25 Next Slide SEM X
    • Critical Values 95% Confidence Intervals Next Slide -1.96 SD +1.96 SD
    • Computing the CI 95% CI 95% = 100 ± (1.96)(3) CI 95% = 100 ± 5.88 -or- CI 95% : 105.88 – 94.12 Next Slide Sample of IQ Scores Mean = 100 SD = 15 N = 25
    • What Does a CI Tell Me? CI 95% = 100 ± 5.88 1. We are 95% confident that the interval around our obtained mean contains the population mean. 2. If we continued to sample from the population an infinite number of times, 95% of those sample means and confidence intervals would capture the population mean. Next Slide
    • Confidence Intervals from a Population Next Slide
    • Unit 4: Statistical Significance Lesson 1: Constructing Confidence Intervals EDER 6010: Statistics for Educational Research Dr. J. Kyle Roberts University of North Texas