H10: The ramp-up rate of the reflow-thermal profile does not affect solder-ball defect.
H1a: The ramp-up rate of the reflow-thermal profile has an effect on solder-ball defect.
H20: The pre-heat time of the reflow-thermal profile does not affect solder-ball defect.
H2a: The pre-heat time of the reflow-thermal profile has an effect on solder-ball defect.
H30: The interaction between the ramp-up rate and the pre-heat time of the reflow-thermal profile does not affect on solder-ball defect.