A public health researcher in Mumbai conducted a study to compare the effectiveness of two different health education interventions on reducing smoking prevalence among 40-year-old males in two urban slums. Group A (n=150) received intensive counselling, while Group B (n=150) received standard pamphlets. After 6 months, 45 subjects in Group A and 30 subjects in Group B had quit smoking. The researcher wants to test whether the difference in quit rates between the two groups is statistically significant. Which test of significance is most appropriate for this analysis?