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We use Formula 8.2 (p. 225) in two situations: 1) When population standard deviation (sigma) is unknown and sample size is large (N is more
We use Formula 8.2 (p. 225) in two situations: 1) When population standard deviation (sigma) is unknown and sample size is large (N is more than 100-120). However, on the left side you should have Z obtained instead of T obtained: Z (obtained) = (X - )/(s/(N-1)) 2) When population standard deviation (sigma) is unknown, and sample is small (N is less than 100 - 120 cases). T(obtained) = (X - )/(s/(N-1))
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