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The Nuts and Bolts of Using Statistics
REVIEW CHAPTER 7!
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Null hypothesis
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Predicts no difference between means of conditions or no relationship between
variables
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Critical region
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Alpha level
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0.05 and 0.01 are commonly used alpha levels
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If the p value is less than the alpha level, you can reject your null hypothesis.
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The p value of 0.03 means that there is a 3% chance of getting the data if your
null hypothesis is true. This percentage is extremely low so we can reject the null
hypothesis.
o
The p value is computed by the statistics and tells the exact probability that the
mean came from when the null hypothesis is true.
USING INFERENTIAL STATISTICS
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Comparing means
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Testing relationships
COMPARING MEANS
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When comparing means, you have four options…
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Onesample
t
test
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Independent samples
t
test
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Paired/related samples
t
test
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ANOVA
COMPARING GROUPS OR CONDITIONS
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Effect
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Is there an effect of my independent variable?
o
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 Spring '09
 claffey

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