Research Methods Module 7: Independent Samples t-test

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Independent groups research design

  • Participants are assigned to, or come from, two or more different groups e.g. treatment/control groups; male/female

  • Research question: Is there a difference between the groups?

<ul><li><p>Participants are assigned to, or come from, two or more different groups e.g. treatment/control groups; male/female</p></li><li><p>Research question: Is there a difference between the groups?</p></li></ul><p></p>
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Independent groups t-test

  • is there a significant difference between the means of the two groups?

  • Null hypothesis (no effect, no difference)

    • H0: u1=u2

    • H0:u1-u2=0

  • Alternative hypothesis (of effect)

    • H1:u1-u2=/ 0

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