In this unit, one more standard of reliability is introduced. And the reliability lovers (frequentists) employ that standard for a certain purpose in the case study of curve fitting. ❖ (20%) State the name of that standard of reliability (but you don’t need to state the definition of that standard). ❖ (30%) State that purpose with 50 words or less (but you don’t need to define any technical terms in use, such as ‘cross-validation).