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11.2: Design Set Up

  • Page ID
    57579
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    Setting up a design consists of three elements: identifying your independent and dependent variables and formatting your hypothesis.

    11.2.1: Independent Variable and Dependent Variable

    The independent variable consists of two dichotomous groups. The independent variable is nominal or categorical, which are synonyms. There can only be two groups for that nominal/categorical variable. Examples are males v. females, Black versus White, treatment completers versus treatment dropouts.

    The dependent variable is continuous. Recall that continuous variables are the ordinal, interval, and ratio variables. There must be a low to high range for these continuous variables.

    Examples are student ratings of teacher effectiveness, level of income, number of sessions attended, ratings of helpfulness of therapy sessions, and number of alcoholic drinks consumed.

    11.2.2: Hypotheses

    Null hypothesis: The two groups have the same mean score.

    Alternative hypothesis: one group has a higher/lower mean score than the other group.

    And that’s it!


    This page titled 11.2: Design Set Up is shared under a CC BY 4.0 license and was authored, remixed, and/or curated by Peter Ji.