A Chi-Square Test for Independence Has Df = 2

question 4

Multiple Choice

A chi-square test for independence has df = 2.What is the total number of categories (cells in the matrix) that were used to classify individuals in the sample?

• A)2
• B)3
• C)4
• D)6

---

Definitions:

Immunoglobin Levels

Concentrations of immunoglobins, which are antibodies that play a key role in the body's immune response, in the bloodstream.

Upper Respiratory Infection

An infection that affects the nasal passages, throat, and airways above the lungs, commonly resulting in symptoms like coughing, sneezing, and a sore throat.

Immunoglobulin G

The most abundant type of antibody in the body, playing a crucial role in the immune response by targeting pathogens.

Passive Immunity

The short-term immunity that results from the introduction of antibodies from another person or animal.