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)
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