Financial Analyst
a Financial Analyst Is to Estimate the Difference

Financial analyst
A financial analyst is to estimate the difference in the average return-on-equity for two industry groups,bank and bank holding companies and nonblank financial companies.The sample data obtained: $$\begin{array} { | c | c | } \hline \text { Bank } & \text { Nonblank } \\\hline n _ { 1 } = 32 & n _ { 2 } = 31 \\\bar { x } _ { 1 } = 13.10 & \bar { x } _ { 2 } = 9.90 \\s _ { 1 } ^ { 2 } = 23.80 & s _ { 2 } ^ { 2 } = 102.57 \\\hline\end{array}$$
-Construct a 98-percent confidence interval for the true difference in means for the return-on-equity between bank and bank holding companies and nonblank financial companies.
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