Which among the following are correct statements about an independent variable?

1.It can have at most two levels

2.It can have any number of levels

3.It can be a qualitative variable

4.It can be a quantitative variable

A1, 3 & 4 only

B2, 3 & 4 only ✓ Correct

C2 & 4 only

D1, 2 & 4 only

Correct answer: (B) 2, 3 & 4 only

Explanation

An independent variable can have any number of levels and be qualitative or quantitative.

It is the presumed cause that the researcher varies or classifies.

The claim of at most two levels is false, since levels are not capped at two.

Treatment dose with several doses shows many quantitative levels.

Type of therapy shows a qualitative independent variable with categories.

The dependent variable is the measured outcome, not the manipulated factor.

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