Lesson 9: Sampling and Inference 2

September 25, 2025

Review:

• Exam 1
• Surveys

Presentation:

• Take surveys
  • Group 1: Exercise https://forms.gle/r2yjBz5Jr44E36Fc7
  • Group 2: Sleep https://forms.gle/LcaHgQDf1nx6a9AS7
  • Group 3: Sports https://forms.gle/1vWUcCVhZZgJu68b8
  • Group 4: Music https://forms.gle/TneysjBcbHd7QXYm9
• Samples and Surveys
  • Toward Statistical Inference
    • Population parameters
    • Sample statistics
    • Sampling distribution
    • Bias and Variability
      • to reduce bias, use random sampling
      • to reduce variability, use larger sample sizes
  • Video: Samples and Surveys

Activity:

• Reconvene Groups
  • Revise Surveys
    • What are you trying to learn?
    • Is there a business case?
    • Can you improve the questions?
    • How do you want to capture the answers?
  • Create a revised set of survey questions
  • Submit revised questions on paper

Assignment:

• Create a Google Form with your survey questions (individually – each person creates a form)
• Ask friends and family to complete your survey
• Summarize results