Lesson 9: Sampling and Inference 2

February 23, 2026

Review:

• Exam 1
• Survey Design

Presentation:

• Take Surveys and Critique
  • Exercise https://forms.gle/r2yjBz5Jr44E36Fc7
  • Sleep https://forms.gle/LcaHgQDf1nx6a9AS7
  • Sports https://forms.gle/1vWUcCVhZZgJu68b8
  • 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:

• Revise Your Survey Questions
  • What are you trying to learn?
  • Can you improve the questions?
  • Will survey respondents understand the questions?
  • Improve your questions.

Assignment:

• Create a Google Form (or similar) with your survey questions
• Ask friends and classmates to complete your survey (n>=10)