1.

Write a sort note on types-I and type-II errors

Answer»

A type I ERROR (or error of the first kind) is the incorrect rejection of a true null hypothesis. Usually a type I error leads one to conclude that a supposed effect or relationship exists when in fact it doesn't. Examples of type I errors include a test that shows a patient to have a disease when in fact the patient does not have the disease, a fire alarm going on indicating a fire when in fact there is no fire, or an experiment indicating that a medical treatment should CURE a disease when in fact it does not.

A type II error (or error of the second kind) is the failure to reject a FALSE null hypothesis. Examples of type II errors would be a blood test failing to detect the disease it was designed to detect, in a patient who REALLY has the disease; a fire breaking out and the fire alarm does not ring; or a clinical trial of a medical treatment failing to show that the treatment WORKS when really it does.[3]



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