Southern Illinois University Carbondale

Construct the confidence interval for $\mu_{1}-\mu_{2}$ for the level of confidence and the data
from independent samples given.
a. $99.5 \%$ confidence,
$$
\begin{array}{l}
\mathrm{v}_{1}-40, \bar{x}_{1}-85.6,-1-2.8 \\
\mathrm{v}_{2}-20, \bar{x}_{2}-72.1, \mathrm{~s}_{2}-2.1
\end{array}
$$
b. $99.9 \%$ confidence,
$$
\mathbf{w}_{1}-25, \bar{x}_{1}-115, n_{1}-7
$$$$
\begin{array}{l}
v_{1}-25, \bar{x}_{1}-215,-1-7 \\
v_{2}-35, \bar{x}_{2}-185,=z-12
\end{array}
$$