Przedziały dla wartości średniej |
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gdy nie znamy sigma, duża próba |
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gdy nie znamy sigma, mała próba |
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t alfa - odczyt z tablic t-studenta dla alfa i n-1 stopni swobody |
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maksymalny błąd oszacowania |
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Rozkład.t.odw |
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minimalna liczebność próby |
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Jeśli n nie jest liczbą naturalną, to zaokrąglamy n w górę. |
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p - frakcja w populacji generalnej , |
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n - liczebność badanej próby, |
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- wartość odczytana z tablic dystrybuanty standaryzowanego rozkładu |
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- frakcja w badanej próbie |
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maksymalny błąd oszacowania |
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minimalna liczebność próby |
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dla dużych prób |
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Przedziały dla miar zmiennności |
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dla małych prób |
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Rozkład.chi.odw |
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Estymacja współczynnika korelacji liniowej |
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1. Przedsiębiorstwo wytwarza elementy konstrukcji metalowych budynków. |
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Odbiorca uznaje wytworzony element konstrukcji, jeżeli spełnia on nałożone normy wymiarowe. |
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Wiadomo, że rozkład długości tych elementów jest normalny. |
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Norma dotycząca długości wynosi (w metrach) 20,0 +/- 0,1. |
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Pobrano próbę 20 elementów. Na poziomie wiarygodności 98% sprawdź, czy przeciętna długość pręta mieści się w granicach normy. |
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Próba (długość w m): |
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19,88 |
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20,33 |
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20,25 |
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19,70 |
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19,95 |
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20,00 |
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20,00 |
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19,68 |
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19,97 |
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20,00 |
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20,00 |
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19,78 |
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20,33 |
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20,00 |
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20,00 |
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20,00 |
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19,92 |
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19,79 |
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19,76 |
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19,67 |
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średnia z próby |
19,95 |
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odchylenie stand. |
0,192100661038835 |
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t |
0,02 |
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2,53948319062396 |
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od |
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Przedział ufności |
19,84 |
20,06 |
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(Na poziomie ufności 0,98 i stopni swobody 19) możemy stwierdzić, że średnia długośc preta produkowana przez przedsiębiorstwo nie spełnia normy |
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25,01,2013 - termin oddania projektu ze statystki |
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