monfils 418_independent t-test

# It is now df n1 n2 2 df 100 100 2 198

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Unformatted text preview:   Violent video versus non- violent video •  We want to compare mean number of aggressive associa\$ons between these two independent groups Independent samples t- test •  These are Bushman’s data •  We s\$ll have means of 7.10 and 5.65, but both of these are sample means. •  We want to test diﬀerences between the two sample means. –  Not between a sample and a popula\$on mean Independent samples t- test •  Now we have two sampling distribu\$ons instead of just one. •  How are sample means distributed if H0 is true? •  Distribu\$ons approach normal as n increases. Sampling DistribuAons of Means •  Means of sampling distribu\$ons: µ1 = µ2 •  Standard devia\$on of sampling distribu\$on (standard error of mean diﬀerences) = sX −X 1 2 1 2 2 2 ss = + n1 n2 Step 1: State Hypotheses •  H0: μ1 = μ2 (There is no diﬀerence between the violent &amp; non- violent sample means) •  H1: μ1 ≠ μ2 (There is a diﬀerence between the violent &amp; non- violent sample means) Step 2: CriAcal region...
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