下表為100 名婦女在懷孕前後吸菸的狀況：懷孕後吸菸 不吸菸 合計吸菸 20 20 40懷孕前不吸菸 5 55 60合計 25 75 100試問下列何種統計檢定法可以用來檢定懷孕是否會改變婦女的吸菸行為？
Pearson’s \mathrm{\chi}^{2} test
\mathrm{\chi}^{2}
Test for the difference between two proportions
McNemar’s \mathrm{\chi}^{2} test
Test for Goodness-of-fit
