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Estadística Descriptiva
(Exemple d’Eines 2.0)

          Toni
  tecotex01@gmail.com

    IES 000000000000000


    5 de juliol de 2010
Índex



  1.- Introducció



  2.- Esquema d’estadística 4t d’ESO



  3.- Un problema estadístic resolt
1.- Introducció




   Aquesta presentació, feta de pressa i corrents, està feta amb les
   eines que jo utilitze habitualment per les meves classes. Són:
    1. LTEX
       A

    2. Pstricks
    3. beamer
2.- Esquema d’estadística 4t d’ESO
les coses que es veuran durant aquesta unitat
3.- Un problema estadístic resolt
passos que hem de seguir per resoldre el problema




    Exemple 01: S’ha realitzat una enquesta a 50 persones d’una
    ciutat determinada. Una de les preguntes era el nombre de
    membres que formen la unitat familiar a la que pertanyen.
    Aquestes són les respostes:

                   2   3   1   4   2   2   5   4   2   3
                   4   4   3   3   4   3   2   2   2   1
                   3   3   3   3   1   1   1   2   2   5
                   3   4   3   1   1   3   2   2   4   1
                   3   4   3   3   1   5   5   2   2   3
Un problema estadístic resolt
rang i recompte de les dades


    En primer lloc ens fixarem en les dades major i menor per veure el
    rang o amplitut de la variable, que és la diferència entre el major i
    el menor valor:
                                 5−1=4
    En segon lloc, ordenem els possibles valors de la variable de 1 a 5 i
    relitzem un recompte de les dades:

                         N. membres     Repeticions
                             1               9
                             2              13
                             3              16
                             4               8
                             5               4
Un problema estadístic resolt
taula de freqüències




    A partir del recompte fet podem obtenir aquesta taula de
    freqüències:

                          xi   fi    fri    %
                          1     9   0.18    18
                          2    13   0.26    26
                          3    16   0.32    32
                          4     8   0.16    16
                          5     4   0.08    8
                               50   1.00   100
Un problema estadístic resolt
gràfic de barres




                                         16
                                         14
                                         12
                   Freqüència relativa


                                         10
                                          8
                                          6
                                          4
                                          2
                                          0                               xi
                                              0   1   2   3   4   5   6
Un problema estadístic resolt
gràfic de sectors
                    13 (26%)



                                                     9 (18%)
                               2
                                       1


                                           5
                                                         4 (8%)
                           3
                                   4

             16 (32%)
                                               8 (16%)

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Act01 beamer

  • 1. Estadística Descriptiva (Exemple d’Eines 2.0) Toni tecotex01@gmail.com IES 000000000000000 5 de juliol de 2010
  • 2. Índex 1.- Introducció 2.- Esquema d’estadística 4t d’ESO 3.- Un problema estadístic resolt
  • 3. 1.- Introducció Aquesta presentació, feta de pressa i corrents, està feta amb les eines que jo utilitze habitualment per les meves classes. Són: 1. LTEX A 2. Pstricks 3. beamer
  • 4. 2.- Esquema d’estadística 4t d’ESO les coses que es veuran durant aquesta unitat
  • 5. 3.- Un problema estadístic resolt passos que hem de seguir per resoldre el problema Exemple 01: S’ha realitzat una enquesta a 50 persones d’una ciutat determinada. Una de les preguntes era el nombre de membres que formen la unitat familiar a la que pertanyen. Aquestes són les respostes: 2 3 1 4 2 2 5 4 2 3 4 4 3 3 4 3 2 2 2 1 3 3 3 3 1 1 1 2 2 5 3 4 3 1 1 3 2 2 4 1 3 4 3 3 1 5 5 2 2 3
  • 6. Un problema estadístic resolt rang i recompte de les dades En primer lloc ens fixarem en les dades major i menor per veure el rang o amplitut de la variable, que és la diferència entre el major i el menor valor: 5−1=4 En segon lloc, ordenem els possibles valors de la variable de 1 a 5 i relitzem un recompte de les dades: N. membres Repeticions 1 9 2 13 3 16 4 8 5 4
  • 7. Un problema estadístic resolt taula de freqüències A partir del recompte fet podem obtenir aquesta taula de freqüències: xi fi fri % 1 9 0.18 18 2 13 0.26 26 3 16 0.32 32 4 8 0.16 16 5 4 0.08 8 50 1.00 100
  • 8. Un problema estadístic resolt gràfic de barres 16 14 12 Freqüència relativa 10 8 6 4 2 0 xi 0 1 2 3 4 5 6
  • 9. Un problema estadístic resolt gràfic de sectors 13 (26%) 9 (18%) 2 1 5 4 (8%) 3 4 16 (32%) 8 (16%)