Independent samples of cafeteria waits: n1 = 36, x-bar 1 = 12.4 min, s1 = 3.6; n2 = 30, x-bar 2 = 10.8 min, s2 = 3.0. Find x-bar 1 minus x-bar 2 and its SE, to two decimals.

Independent samples of phone battery remaining: n1 = 16, x-bar 1 = 88.2 percent, s1 = 4.8; n2 = 25, x-bar 2 = 84.7 percent, s2 = 5.0. Find x-bar 1 minus x-bar 2 and its SE, to two decimals.

Independent samples of plant heights: n1 = 40, x-bar 1 = 32.6 cm, s1 = 6.0; n2 = 35, x-bar 2 = 30.1 cm, s2 = 5.5. What are x-bar 1 minus x-bar 2 and its SE, to two decimals?

Independent samples of package masses: n1 = 50, x-bar 1 = 506 g, s1 = 12; n2 = 45, x-bar 2 = 498 g, s2 = 15. What are x-bar 1 minus x-bar 2 and its SE, to two decimals?

Independent samples of bike commute distances: n1 = 18, x-bar 1 = 7.8 km, s1 = 2.4; n2 = 22, x-bar 2 = 6.9 km, s2 = 2.0. Find x-bar 1 minus x-bar 2 and its SE, to two decimals.

Independent samples of seedling heights: n1 = 20, x-bar 1 = 18.4 cm, s1 = 3.2; n2 = 18, x-bar 2 = 16.1 cm, s2 = 2.8. For H0: mu 1 minus mu 2 = 0, what is the two-sample t statistic, to two decimals?

Independent samples of clinic recovery time: n1 = 28, x-bar 1 = 5.6 days, s1 = 1.4; n2 = 24, x-bar 2 = 6.2 days, s2 = 1.8. For H0: mu 1 minus mu 2 = 0, find the two-sample t statistic, to two decimals.

Independent samples of daily app use: n1 = 32, x-bar 1 = 42.5 min, s1 = 8.0; n2 = 30, x-bar 2 = 38.9 min, s2 = 7.0. For H0: mu 1 minus mu 2 = 0, what is the two-sample t statistic, to two decimals?

Independent samples of printer cartridge life: n1 = 15, x-bar 1 = 121 pages, s1 = 18; n2 = 17, x-bar 2 = 110 pages, s2 = 16. For H0: mu 1 minus mu 2 = 0, find the two-sample t statistic, to two decimals.

Independent samples of soccer drill times: n1 = 26, x-bar 1 = 14.8 s, s1 = 2.6; n2 = 22, x-bar 2 = 16.0 s, s2 = 3.1. For H0: mu 1 minus mu 2 = 0, what is the two-sample t statistic, to two decimals?

From independent samples, a 95 percent two-sample t interval for mu 1 minus mu 2, mean recycling kg per week for dorm 1 minus dorm 2, is (2.4, 7.6) kg. What comparison is supported?

From independent samples, a 95 percent two-sample t interval for mu 1 minus mu 2, online quiz score minus in-person quiz score, is (-6.8, -1.2) points. What comparison is supported?

From independent samples, a 90 percent two-sample t interval for mu A minus mu B, mean water used by filter A minus filter B, is (-0.9, 2.7) liters. What comparison is supported?

From independent samples, a 95 percent two-sample t interval for mu 1 minus mu 2, mean temperature rise under coating 1 minus coating 2, is (0.3, 1.9) °C. What comparison is supported?

From independent samples, a 99 percent two-sample t interval for mu 1 minus mu 2, mean checkout time for machine 1 minus machine 2, is (-4.5, -0.8) minutes. What comparison is supported?

Independent samples of tablet battery life: brand A n = 12, x-bar = 9.4 h, s = 1.1. Brand B n = 14, x-bar = 8.8 h, s = 1.3. Both dot plots are symmetric with no outliers. Testing any difference, what setup fits?

Independent samples of daily steps: school 1 n = 18, x-bar = 7200, s = 1100. School 2 n = 16, x-bar = 6800, s = 1200. Both dot plots are symmetric with no outliers. Testing if school 1's mean is higher, what setup fits?

Independent samples of assembly times: new method n = 10, x-bar = 23.4 min, s = 3.2. Old method n = 11, x-bar = 25.1 min, s = 3.5. Both dot plots are symmetric with no outliers. Testing if the new mean is lower, what setup fits?

Independent samples of nitrate concentration: upstream n = 9, x-bar = 4.8 mg/L, s = 0.7. Downstream n = 13, x-bar = 5.2 mg/L, s = 0.9. Both boxplots are symmetric with no outliers. Testing any difference, what setup fits?

Independent samples of delivery times: route 1 n = 12, x-bar = 31 min, s = 8; route 2 n = 14, x-bar = 28 min, s = 7. Route 1 is strongly skewed with one high outlier; route 2 is symmetric. Testing any mean difference, what setup is appropriate?