stats pt 3

• Data Collection

  Location calculator
• Keywords

  • Regression
  • Correlation
  • Discrete Uniform Distribution
  • Hypothesis Testing
  • Mean
  • Product Moment Correlation Coefficient
  • Probabilities of outcomes all equal
• Census

  Measures every member of a population
• Null Hypothesis (Ho)

  What we assume to be true
• Alternative Hypothesis (H1)

  What would be true if Ho is wrong
• Significance Level (α)

  The given threshold of likeliness
• Sampling frame

  List of sampling units
• Regression Line

  Line of best fit y = a + bx
• Binomial Distribution

  Fixed number of trials, n, and fixed probability of success, p
• One-tailed Test

  When H1: p > k or p < k
• Two-tailed Test

  When H1: p ≠ k
• Simple Random Sampling

  Same chance of being selected
• Systematic Sampling

  Take every kth unit, k = Ps/m
• Stratified Sampling

  Sample represents groups (strata) of population
• Quota Sampling

  Strata filled by interviewer/researcher
• Opportunity Sampling

  Quota filled by those available at the time
• Quantitative Data

  Numerical, either discrete or continuous
• Coding

  If y = a + bx, then y = a + rx
• Standard Normal Distribution


  Z ~ N(0,1)
• Mutually Exclusive

  If A and B are mutually exclusive, P(A and B) = 0
• Independence


  If A and B are independent, P(A and B) = P(A) * P(B)
• Approximating Binomial as Normal


  If n is large, μ = np, σ = √(npq)
• Conditional Probability


  P(B|A) = P(A and B) / P(A)
• Continuity Correction


  Reduce the whole area by 1/2n
• Addition Law

  P(A or B) = P(A) + P(B) - P(A and B)
• Sample Mean

  Ho: μ = k, H1: μ > k or μ < k or μ ≠ k