Calculate missing value for the promissory note: 
Definitions:
Null Hypothesis
A statistical hypothesis that indicates no effect or no difference in the context of scientific experiments, assuming the observation results from chance.
Control
The use of standardized procedures and conditions in scientific experiments to ensure that changes observed in an experiment are due to the manipulation of the independent variable.
Significance Level
The probability of rejecting the null hypothesis when it is true, often denoted by alpha (α).
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