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Statistik

Statistik. Kristine og Søren. MATEMATISKE TEGN INDEN FOR STATISTIK:. X = Gennemsnit Xi = Observation Hi = Hyppighed K = Antal af observationer fi = frekvens n = Summen af hyppigheder Fi = Summeret frekvens mi = midterinterval = Sum (sigma). Observationer.

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Statistik

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  1. Statistik Kristine og Søren

  2. MATEMATISKE TEGN INDEN FOR STATISTIK: • X = Gennemsnit • Xi = Observation • Hi = Hyppighed • K = Antal af observationer • fi = frekvens • n = Summen af hyppigheder • Fi = Summeret frekvens • mi = midterinterval • = Sum (sigma)

  3. Observationer • Man aflæser/måler noget • Diskret • Ikke grupperede • Præcis statistik • Grupperede • Observationer samlet i intervaller

  4. Statistisk tabel • En tabel med diskrete observationer, man vælger at tage forskellige skostørrelser i en klasse af 31 elever. • Hyppighed • Frekvens h*100/n • Summerede frekvens • Lægger frekvenser sammen

  5. Gennemsnit • Formel for beregning af gennemsnit for diskret observationer • Grupperede observationer • Midt intervallet i stedet for observation • [10;20] – 15

  6. Diskret: Trappe diagram • Diskret observationer vises i trappe diagram • 1 kvartil: 25 % • 2 kvartil: 50 % • 3 kvartil: 75 %

  7. Grupperede: Sumkurve • Grupperede observationer vises i en sumkurve • 1 kvartil: 25 % • 2 kvartil: 50 % • 3 kvartil: 75 %

  8. Bionomiali Nspire

  9. Forklare formelP(X=r)=K(n,r)*

  10. Bionormal statistik i Nspire • Beregning af • Gennemsnit • Varians • Standardafvigelse • Værktøj Statisk beregningmed én variabel

  11. Graf for binomial • Pindediagram • Hver pind viser P(x=?) Her: Xb(20,.30%)

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