Lesson 18: Significance Testing

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October 31, 2016 at 10:00 am  •  Posted in f16-busad265 by  •  0 Comments

Mon, Oct 31

Review:

  • Inference for Proportions
  • Voter estimation assignment – due in 1 week

Presentation:

  • Test of Statistical Significance
  • Hypothesis Testing
    • Null hypothesis, Ho (p. 375)
    • Alternative hypothesis, Ha (p. 375)
    • P-value (p. 377)
    • z-test for population mean (p. 383)
    • α = 0.05 (same as 95% confidence)
  • Example Problem 6.15 (p. 383-384)
    • Ho: μ = 168, Ha: μ ≠ 168
    • x-bar = 173.7, n=71, σ = 27, α = 0.05
  • Tests of Significance Video
  • Example Problem 6.16 (p. 385)
    • Ho: μ = 450, Ha: μ ≠ 450
    • x-bar = 461, n=500, σ = 100, α = 0.05

Activity:

  • Problems
    • Ho: μ = 25, Ha: μ ≠ 25, x-bar = 28.2, n=64, σ = 8.4, α = 0.05
    • Ho: μ = 7.4, Ha: μ ≠ 7.4, x-bar = 6.9, n=24, σ = 1.2, α = 0.05
    • Ho: μ = 1200, Ha: μ ≠ 1200, x-bar = 1215, n=121, σ = 100, α = 0.05

Assignment:

  • Read pp. 372-386, Tests of Significance
  • Voter estimation exercise – Due in class on Monday Nov 7
    • Estimate total number of votes cast in Pueblo County
      • For President of the United States
      • For US Senate (Bennet vs Glenn)
      • For US Representative to Colorado’s 3rd Congressional District (Tipton vs Schwartz)
    • Estimate % votes cast in Pueblo County
      • For Hillary Clinton
      • For Donald Trump
      • For Bennet
      • For Glenn
      • For Tipton
      • For Schwartz
      • For (vote Yes) Proposition 200
    • Explain your methodology
    • Hint: pueblovotes.com

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