A Test Was Made Of $H _ { 0 } : \mu _ { 1 } = \mu _ { 2 }$

Multiple Choice

A test was made of $H _ { 0 } : \mu _ { 1 } = \mu _ { 2 }$ versus $H _ { 1 } : \mu _ { 1 } < \mu _ { 2 }$ . The sample means were $\bar { x } _ { 1 } = 7$ and $\bar { x } _ { 2 } = 11$ , the sample standard deviations were $s _ { 1 } = 6$ and $s _ { 2 } = 4$ , and the sample sizes were $n _ { 1 } = 10$ and $n _ { 2 } = 18$ .
Compute the value of the test statistic.

A) -1.888
B) -4.411
C) -0.555
D) -2.935