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2 May, 13:20

A chi-square test for independence is used to evaluate the relationship between two variables. If both variables are classified into two categories, then what is the df value for the chi-square statistic?

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  1. 2 May, 13:54
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    df = (r - 1) * (c - 1)

    Step-by-step explanation:

    Chi square is calculated when simple random sampling is known and variable are categorical.

    Four steps are included in chi-square:

    (1) state the hypotheses

    (2) formulate an analysis plan

    (3) analyze sample data

    (4) interpret results.

    State the hypothesis is

    null hypothesis: Variable a and variable b are independent.

    H 1: Variable a and variable bare not independent.

    Formulate analysis plan:

    This plan describe the significance level and test statistic.

    Analyze the sample data

    We analyze the degree of freedom and expected frequencies.

    The degree of freedom formula is

    df = (r - 1) * (c - 1)

    r = number of levels for one categorical variable

    c = number of levels for the other categorical variable
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