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Project Name; D; D;问题记述;问题记述;问题记述;问题记述;问题记述; D; M; M; M; M; M; M; M; M; M; M;Two-sample T for a vs b
N Mean StDev SE Mean
a 10 74.70 4.32 1.4
b 10 80.80 3.94 1.2
Difference = mu a - mu b
Estimate for difference: -6.10
95% CI for difference: (-9.98, -2.22)
T-Test of difference = 0 (vs not =): T-Value = -3.30 P-Value = 0.004 DF = 18
Both use Pooled StDev = 4.13; M; M; M; M;Two-sample T for i vs j
N Mean StDev SE Mean
i 10 73.40 3.81 1.2
j 10 78.50 3.98 1.3
Difference = mu i - mu j
Estimate for difference: -5.10
95% CI for difference: (-8.76, -1.44)
T-Test of difference = 0 (vs not =): T-Value = -2.93 P-Value = 0.009 DF = 18
Both use Pooled StDev = 3.89
; M;Two-Sample T-Test and CI: C1, C2
Two-sample T for C1 vs C2
N Mean StDev SE Mean
C1 20 14.330 0.462 0.10
C2 20 7.165 0.281 0.063
Difference = mu C1 - mu C2
Estimate for difference: 7.165
95% lower bound for difference: 6.961
T-Test of difference = 0 (vs ): T-Value = 59.19 P-Value = 0.000 DF = 38
Both use Pooled StDev = 0.383; M; M; M; M; M; M; M; M; M; M; M; M; M; M; M; M; M; M; M; M; M
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