A Paired Difference Experiment Yielded $\mathrm { n } _ { \mathrm { d } }$

Multiple Choice

A paired difference experiment yielded $\mathrm { n } _ { \mathrm { d } }$ pairs of observations. For the given case, what is the rejection region for testing $\mathrm { H } _ { 0 } : \mu _ { \mathrm { d } } = 9$ against $\mathrm { Ha } ^ { \mathrm { a } } \mu _ { \mathrm { d } } > 9$ ?
$$\mathrm { n } _ { \mathrm { d } } = 12 , \alpha = 0.01$$

A) $t < 2.718$
B) $t > 2.718$
C) $t > 2.681$
D) $t < 3.106$