In Srilanka a study was conducted to investigate whether exposure to indoor air pollution due to cooking stove was associated with increased risk of cataract among rural women. Both the exposure and outcome was measured as dichotomous variables (yes/no).In total, 130 women were recruited into the study, 30 with cataract and 100 without cataract.

Pearson's correlation

Spearman correlation

Paired (matched) t-test

Wilcoxon signed rank test

Simple linear regression analysis

Pearson²-test

For the following scenario, identify thebeststatistical procedure the researchers should use and why.