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 $\bar { x } _ { 1 } = 14$ and $\bar { x } _ { 2 } = 15$ , the sample standard deviations were $s _ { 1 } = 7$ and $s _ { 2 } = 6$ , and the sample sizes were $n _ { 1 } = 20$ and $n _ { 2 } = 16$ . How many degrees of freedom are there for the test statistic, using the simple method?

A) 15
B) 16
C) 13
D) 17