Test Hypotheses Regarding the Difference of Two Independent Means
-Find $t$

Multiple Choice

Test Hypotheses Regarding the Difference of Two Independent Means
-Find the standardized test statistic, $t$ , to test the hypothesis that $\mu _ { 1 } = \mu _ { 2 }$ . Two samples are randomly selected and come from populations that are normal. The sample statistics are given below.
$$\begin{array} { l l } \mathrm { n } _ { 1 } = 14 & \mathrm { n } _ { 2 } = 12 \\\overline { \mathrm { x } } 1 = 10 & \overline { \mathrm { x } } 2 = 11 \\\mathrm {~s} _ { 1 } = 2.5 & \mathrm {~s} _ { 2 } = 2.8\end{array}$$

A) $- 0.954$
B) $- 0.915$
C) $- 1.558$
D) $- 0.909$