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

Multiple Choice

Test Hypotheses Regarding the Difference of Two Independent Means
-Find the standardized test statistic to test the hypothesis that $\mu _ { 1 } = \mu _ { 2 }$ . Two samples are randomly selected from each population. The sample statistics are given below. Use $\alpha = 0.05$ .
$$\begin{array} { l l } \mathrm { n } _ { 1 } = 40 & \mathrm { n } _ { 2 } = 35 \\\overline { \mathrm { x } } 1 = 17 & \overline { \mathrm { x } } _ { 2 } = 18 \\\mathrm {~s} 1 = 2.5 & \mathrm {~s} _ { 2 } = 2.8\end{array}$$

A) $- 1.6$
B) $- 0.8$
C) $- 2.6$
D) $- 1.0$