An ill posed problem is one which **doesn’t **meet the three *Hadamard criteria* for being well-posed. These criteria are:

- Having a solution
- Having a unique solution
- Having a solution that depends continuously on the parameters or input data.

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*Statistical concepts explained visually* - Includes many concepts such as sample size, hypothesis tests, or logistic regression, explained by Stephanie Glen, founder of StatisticsHowTo.

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