monfils 418_independent t-test

Scores on the measure range from 0 to 60 with high

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Unformatted text preview:   Alpha = .05, two- tailed •  There is a small change to the degrees of freedom formula when we have two independent groups. It is now: –  df = n1 + n2 - 2 –  df = 100 + 100 - 2 = 198 •  tcriAcal = Step 2: CriAcal region •  Alpha = .05, two- tailed •  There is a small change to the degrees of freedom formula when we have two independent groups. It is now: –  df = n1 + n2 - 2 –  df = 100 + 100 - 2 = 198 •  tcriAcal = ±1.96 Step 3: Analyze the Data Violent video 7.10 4.40 19.36 n 100 NonViolent video 5.65 3.20 10.24 100 Condition Mean St. Dev. Variance Step 3, cont’d •  Same basic formula as before, but with accommoda$on for 2 groups. X1 − X 2 X1 − X 2 t= =2 2 sX −X s1 s2 + n1 n2 1 2 •  Note parallels with earlier t formulas Step 3: CalculaAon, ConAnued X1 − X 2 X1 − X 2 t= =2 sX −X s1 s22 + n1 n2 1 = 2 1.45 √.1936 + .1024 = 7.10 – 5.65 19.36 10.24 + 100 100 = 1.45 √.296 = 1.45 .544 = 2.67 Step 4: Conclusions •  Since 2.67 > 1.97, reject H0. •  We conclude that those who watch violent videos produce more aggressive word associa$ons than those who watch nonviolent videos. Prac$ce problems: A research study was conducted to examine...
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This test prep was uploaded on 04/02/2014 for the course PSY 418 taught by Professor Haley during the Spring '08 term at University of Texas at Austin.

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