Null Hypothesis

10 cards | Total Attempts: 190 | Created by Pam5 | Last updated: Mar 22, 2018 | Total Attempts: 190

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Null Hypothesis - Flashcards

NULL HYPOTHESIS

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Cards In This Set

Front	Back
NULL HYPOTHESIS	Start off with this. There is no chance, no difference between exposure and outcome eg. tobacco smoke and lung cancer.
H₀	Null Hypothesis
Alternative Hypothesis. Yes. There is a difference/association in the population	H1
I FAIL TO REJECT THE NULL HYPOTHESIS.	The H₀is true.
Yes, H₁ is true.	I REJECT THE NULL HYPOTHESIS
P VALUERESULT OF CHANCE/PROBABILITY	Between 0 and 1
UNLIKELY TO BE CHANCEEVIDENCE FOR THE ALTERNATIVE HYPOTHESIS H₁ REJECT THE NULL / REAL DIFFERENCE	Small P's less than or equal to 0.05 or 5%
More than 0.05 or 5%	YES IT WAS CHANCE. REJECT THE NULL (ACCEPT IT) AND CONCLUDE THERE IS NO EVIDENCE OF A REAL DIFFERENCE/ASSOCIATION IN THE POPULATION
TYPE 1 ERROR	False positive -- A false alarm - Rejecting the null hypothesis when it is true
A Type II error	FAIL TO REJECT THE NULL HYPOTHESIS WHEN YOU SHOULD HAVE (IT IS FALSE). HAVE A SUFFICIENT SAMPLE SIZE TO DETECT A DIFFERENT ASSOCIATION IF ONE EXISTS