Test Hypotheses Regarding the Difference of Two Independent Means
-Find $\mu _ { 1 } \neq \mu _ { 2 }$

Multiple Choice

Test Hypotheses Regarding the Difference of Two Independent Means
-Find the standardized test statistic, t, to test the hypothesis that $\mu _ { 1 } \neq \mu _ { 2 }$ . Two samples are randomly selected and come from populations that are normal. The sample statistics are given below.
$$\begin{array} { l l } \mathrm { n } _ { 1 } = 11 & \mathrm { n } _ { 2 } = 18 \\\overline { \mathrm { x } } 1 = 5.1 & \overline { \mathrm { x } } 2 = 5.5 \\\mathrm {~s} 1 = 0.76 & \mathrm {~s} _ { 2 } = 0.51\end{array}$$

A) $\mathbf { - 1 . 5 4 6 }$
B) $- 1.821$
C) $- 2.123$
D) $- 1.326$