假设检验例子
KPIV Detail
Updated the conveyer speed, make the hypothesis test to check the significant or not.
Hypothesis Statement
Two proportion test
Ho: W/S defect rate (pre-Change the speed) = U21 defect rate (After changing the conveyer speed)
Ha: W/S defect rate (pre-Change the speed) ≠ U21 defect rate (After changing the conveyer speed)
Power and Sample size
Power and Sample Size
Test for Two Proportions
Testing proportion 1 = proportion 2 (versus not =)
Calculating power for proportion 2 = 0.5
Alpha = 0.05
Sample Target
Proportion 1 Size Power Actual Power
0.3 93 0.8 0.800006
sample size=93
The sample size is for each group.
Test and CI for Two Proportions
Sample X N Sample p
1 42023 69774 0.602273
2 6520 13664 0.477166
Difference = p (1) - p (2)
Estimate for difference: 0.125107
95% CI for difference: (0.115978, 0.134235)
Test for difference = 0 (vs not = 0): Z = 26.86 P-Value = 0.000
Hypothesis test conclusion
P value = 0.00 (reject Ho, It is significant that Wave soldering parameter setting mainly affect W/S defect rate)
这是我的一个GB做的presentation内容，刚才上传的时候没仔细看
Updated the conveyer speed, make the hypothesis test to check the significant or not.
Hypothesis Statement
Two proportion test
Ho: W/S defect rate (pre-Change the speed) = U21 defect rate (After changing the conveyer speed)
Ha: W/S defect rate (pre-Change the speed) ≠ U21 defect rate (After changing the conveyer speed)
Power and Sample size
Power and Sample Size
Test for Two Proportions
Testing proportion 1 = proportion 2 (versus not =)
Calculating power for proportion 2 = 0.5
Alpha = 0.05
Sample Target
Proportion 1 Size Power Actual Power
0.3 93 0.8 0.800006
sample size=93
The sample size is for each group.
Test and CI for Two Proportions
Sample X N Sample p
1 42023 69774 0.602273
2 6520 13664 0.477166
Difference = p (1) - p (2)
Estimate for difference: 0.125107
95% CI for difference: (0.115978, 0.134235)
Test for difference = 0 (vs not = 0): Z = 26.86 P-Value = 0.000
Hypothesis test conclusion
P value = 0.00 (reject Ho, It is significant that Wave soldering parameter setting mainly affect W/S defect rate)
这是我的一个GB做的presentation内容，刚才上传的时候没仔细看
(accept Ha, It is significant that Wave soldering parameter setting mainly affect W/S defect rate)
P value = 0.00 <a, DON'T said u can accept Ha, only mean refuse H0...:lol:
P value = 0.00 <a, DON'T said u can accept Ha, only mean refuse H0...:lol:
2007-06-05 10:28
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