What hypothesis test should be used to test H₁: X₁ X₂ < 0 O Left tailed, one-sample test of means O Right tailed, one-sample test of means O Left tailed, one-sample test of proportions O Right tailed, one-sample test of proportions O Left tailed, one-sample test of variances O Right tailed, one-sample test of variances O Left tailed, two-sample test of means (independent samples) Right tailed, two-sample test of means (independent samples) O Left tailed, two-sample test of means (paired samples) O Right tailed, two-sample test of means (paired samples) O Left tailed, two-sample test of proportions O Right tailed, two-sample test of proportions O Left tailed, two-sample test of variances O Right tailed, two-sample test of variances