Estistica

————— 8/11/2011 21:10:43 ————————————————————

Welcome to Minitab, press F1 for help. Probability Plot of AMOSTRA 1

Probability Plot of AMOSTRA 2

Probability Plot of AMOSTRA 3

Test for Equal Variances: C5 versus C6

95% Bonferroni confidence intervals for standard deviations

C6 N Lower StDev Upper
AMOSTRA 1 100 1,20355 1,40965 1,69485
AMOSTRA 2 100 1,02125 1,19614 1,43814
AMOSTRA 3 100 0,33168 0,38848 0,46707

Bartlett's Test (Normal Distribution)
Test statistic = 134,73; p-value = 0,000

Levene's Test (Any Continuous Distribution)
Test statistic = 54,26; p-value = 0,000

Test for Equal Variances: C5 versus C6

One-way ANOVA: C5 versus C6

Source DF SS MS F P
C6 2 19,23 9,62 8,08 0,000
Error 297 353,31 1,19
Total 299 372,54

S = 1,091 R-Sq = 5,16% R-Sq(adj) = 4,52%

Level N Mean StDev
AMOSTRA 1 100 40,081 1,410
AMOSTRA 2 100 40,367 1,196
AMOSTRA 3 100 40,700 0,388

Individual 95% CIs For Mean Based on Pooled StDev
Level -+---------+---------+---------+--------
AMOSTRA 1 (------*------)
AMOSTRA 2 (-------*------)
AMOSTRA 3 (------*------) -+---------+---------+---------+-------- 39,90 40,20 40,50 40,80

Pooled StDev = 1,091

Two-Sample T-Test and CI: AMOSTRA 2; AMOSTRA 3

Two-sample T for AMOSTRA 2 vs AMOSTRA 3

N Mean StDev SE Mean
AMOSTRA 2 100 40,37 1,20 0,12
AMOSTRA 3 100 40,700 0,388 0,039

Difference = mu (AMOSTRA 2) - mu (AMOSTRA 3)
Estimate for difference: -0,333
95% CI for difference: (-0,582; -0,084)
T-Test of difference = 0 (vs not =): T-Value = -2,65 P-Value = 0,009 DF =119

OBS: NA AMOSTRA 2 E 3, AS MEDIAS NÃO SÃO ESTATISTICAMENTES IGUAIS POIS P-VALUE< 0.05

Two-Sample T-Test and CI: AMOSTRA 1; AMOSTRA 2

Two-sample T