Discussion
If one variable is measured on nominal scale and other variable is measured on interval scale, the appropriate research method will be :
Answer: A
The key's answer is Experimental method.
A nominal variable sorts people into categories, such as treatment and control groups, while an interval variable gives measured scores. That is the typical structure of an experiment: the groups (nominal) are the independent variable and the measured outcome (interval) is the dependent variable, compared with tests such as t or ANOVA.
The correlation method needs two variables measured on at least an ordinal or interval scale, a case study examines one unit in depth without measuring such variables across groups, and the cross-sectional method describes when data are collected rather than how the two variables relate.
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