We are interested in investigating association between two categorical (nominal)

Question

We are interested in investigating association between two categorical (nominal) varaiables (row variable = the outcome with four unranked categories, and column variable= the type of intervention with three catagories, and the cell frequencies represent the count of study participants that fell into each category.

Part 1. Why would you run that particular statistical test? Select all that apply and show work.

a. because the independent variable is nomial and the dependent variable is continuous

b. because the independent variable is continuous and the dependent variable are nomial

c. because the independent and dependent varaible are nomial

d. because the data are provided as frequency or counts.

Part D. How many degrees of freedom does this statistical test have? a. 3    b. 13 c. 6 d. 123

outcome Intervention A Intervention B Intervention C Row Total Category 1 6 8 15 29 Category 2 14 15 10 39 Category 3 8 5 7 20 Catagory 4 22 7 9 38 Column total 50 35 41 126

Explanation / Answer

Here we use chi-square test of independence.

Part 1

D) because the data are provided as frequency or counts.

Part D. Degree of freedom =(4-1)*(3-1)=3*2=6

Answer is C. 6

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