Looking at the following partial calendar for April, when will individual tax returns be due? 
Definitions:
One-sample T Statistic
A statistic used in hypothesis testing that compares the mean of a single sample to a known value, often to determine if the sample mean differs significantly from the population mean.
Electronic Control
The use of electronic devices or systems to regulate the operation of machines or processes, enhancing efficiency, accuracy, and safety.
Calibration
The process of adjusting and verifying the accuracy of a measuring instrument by comparison with a standard.
Significance Test
A statistical procedure used to test if the observed results significantly differ from what was expected under the null hypothesis.
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