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Variância

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by

Priscila Missaki Nakamura

on 30 October 2015

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Transcript of Variância

Variância
Medir as oscilações
Medidas de variabilidade
Amplitude de variação
A= Maior valor - Menor valor
Amplitude interquartil
Terceiro quartil - Primeiro quartil


75 percentil - 25 percentil
Variância
A
Amplitude de variação;

Amplitude interquartil;

Variância;

Desvio padrão;

Erro padrão

10,20,30,45,50,70
10-70
Quartis
Percentil
B
8
9
10
8
6
11
7
13
7
3
10
6
5
13
18
10
Total= 72
Atiradores= 8
Total= 72
Atiradores= 8
X=9
Aa= 6-13
Ab= 3-18
Aa= 7
Ab= 15
Média
1) Subtrair cada valor da minha média=0
Xi-X=xi
2) Elevar xi ao quadrado;
3) Somar os quadrados;
4)Dividir a soma dos quadrados pelo número
de "parcela - 8 N- população, n-1 amostra
A= 5,1 acertos
B= 23,4 acertos
2
2
Desvio Padrão
Desvio padrão
Dp nunca pode ser negativo;

O menor valor do DP =0;

Influenciado por valores extremos;

Mesma unidade dos dados originais
Erro padrão
Amostra População
Full transcript