Statistics

    Subdecks (6)

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    • Equation for relative sampling error, with proportion of cases (p) instead of mean:
      r=r =±ta/21ppn(1nN) \pm t_{a/2} \cdot \sqrt{\frac{1-p}{p \cdot n} \left(1-\frac{n}{N}\right)}
    • Equation to compute relative sampling accuracy:
      r=r =±ta/2SxnX1nN \pm \frac{t_{a/2}S_x}{\sqrt{n}\overline X}\cdot\sqrt{1-\frac{n}{N}}
    • What is a variance?
      Means how possible values spread around the value. Usually use mean as a main value.
    • How co compute variance (for a sample set)?
      σ2=\sigma^2 =Σi=1n(xixˉ)2n1 \frac{\Sigma_{i=1}^n(x_i-\bar x)^2}{n-1}
    • How to compute variance for a population set?

      σ2=\sigma^2 =Σi=1n(xixˉ)2n \frac{\Sigma_{i=1}^n(x_i-\bar x)^2}{n}
    • Simplified equation for standard error, with given population's st.deviation:
      st.Error=st.Error =σn \frac{\sigma}{\sqrt{n}}
    • Simplified equation for standard error, with sample standard deviation:
      St.Error=St.Error =sn \frac{s}{\sqrt{n}}
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