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9 Cards in this Set
- Front
- Back
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Null Hypothesis
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A statement of no differnce or no relationship
H0: m1 = m2 -Reliability of results -States no differences between treatments, or no relationships between variables -If there is a difference or a relationship: null hypothesis should be rejected |
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Alternative Hypothesis
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A logical state of reality that must exist if the null hypothesis is not true.
HA : m1 ≠ m2 |
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Type 1 Error
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Rejecting the null hypothesis when it is true.
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Type 2 Error
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Accepting the null hypothesis when it is false
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Level of Significance
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The statistical reference point that is selected for the purpose of accepting or rejecting th enull hypotheses.
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Alpha (probability)
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-Probability of finding a difference when there is no difference
-Level of significance -Typically : p < .05 or p < .01 |
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Beta (probability)
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-Probability of not finding a difference, when there is a difference
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When should a One-tailed test be appropriate?
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When the researcher has a strong sense of the direction of the outcome.
-Hypothesis : m1 > m2 or m1 < m2 |
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When should a two tailed test be appropriate?
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When the researcher cannot hypothesize about the direction of the outcome.
-Hypothesis : m1 ≠ m2 |
