Power is the probability that a study will reject the null hypothesis. The estimated. probability is a function of sample size, variability, level of significance, and the. difference between the null and alternative hypotheses. Similarly, the sample size. required to ensure a pre-specified power for a hypothesis test depends on variability, level of significance, and the null vs. alternative difference.
Nature of stale check. Stale check is a check that is presented to be cashed or deposited at a bank six months or more after the date it was written.
Report Abuse. Unless otherwise marked, checks go stale 6 months from the date on the check. US Treasury checks are marked as valid for one year however if your state refund check has not such markings it went stale back in September. You'll have to return it to the state and ask to have it reissued. Source(s): Used to work in the banking industry.