Flashcards
Chapter 10-12
Cards in this deck (20)
- 1HypothesisSomething you believe to be true in a population
- 2Independent Variablethe thing you make different
- 3Dependent Variablethe change
- 4Alpha Levelprobability limit & threshold sets the standard you have to beat in order to give credit to the Independent Variable
p<.05 - 5STATISTICAL SIGNIFICANCEresults of the experiment met 5% cutoff & youll conclude your results are probably b/c of Independent Variable
- 6Type I Errorconclude Independent variable is best choice, but in reality it was chance
= <.05 - 7Type II Errorconclude it was chance, but in reality it was probably your Independent Variable
AS High AS 95% - 8Null HypothesisIndependent Variable HAS NO EFFECT ON DEPENDENT VARIABLE
- 9Alternative Hypothesis (Ha) Non-DirectionalIndependent Variable DOES HAVE effect on dependent variable (2-tailed)
- 10Alternative Hypothesis (Ha) DirectionalIndependent Variable has effect by increase/decrease in dependent variable (1 tailed)
- 11Reject Null Hypothesis (Ho)if results rarely happen by chance...reject Null Hypothesis under 5% cutoff
Type I Error - 12Retain HoCant beat 5% cutoff have to keep hypothesis
Type II Error
I.V. probably didnt work - 13Standard Erroradjusted standard deviation
- 14Central Limit TheoremSample size of 30 or more (mean distribution will be normal)
- 15Powerprobability that results of your experiment will allow you to reject your Null Hypothesis
- 16Increase Power to Reject Null (5)Power increase as N increases (*)
"" as Alpha Increases
"" as Type II Error rates decrease
"" as effect size increases (*)
Depends on test - 17Effect sizestatistic that indicates strength of influence Independent Variable has on Dependent Variable
(always in numerator of z test) - 18Whats so great about Statistical Significance?Shows why, best explanation
-Related b/c a strong I.V. makes it more likely to reject the Null - 19When is Power important?When designing your experiment give it as much power as possible
When you have to retain the Null - 20Percentagehow often you will reject the null based on 3 things:
N size
Alpha level
Effect Size
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- Statistics Flashcards on Chapter 10-12, created by nicknicknicke on 08/10/2013.
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