Confidence Interval for μ, Standard Deviation Estimated (3 of 3)

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Summary of Computations
  1. Compute M = ΣX/N

  2. Compute s (click for formula)

  3. Compute sem = s divided by square root of N

  4. Compute df = N-1

  5. Find t for these df using a t table

  6. Lower limit = M - t sM

  7. Upper limit = M + t sM

  8. Lower limit ≤ μ ≤ Upper limit

Assumptions:
  1. Normal distribution

  2. Scores are sampled randomly and are independent



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