Investigators compared Hemoglobin A1c's for individuals on a Western diet versus those on a Mediterranean diet. For those on a Western diet, quartiles were 4.5, 7.0, and 9.5. Among those on the Mediterranean diet, quartiles were 5.0, 6.2, and 7.5. What is the most appropriate test for this scenario?

Group of answer choices

Paired t-test

Two group t-test unequal variances

Two group t-test equal variances

Mann-Whitney U test

Test of Correlation

Chi-square test