An Analyst Is Looking at Two Portfolios of Common Stocks

Short Answer

An analyst is looking at two portfolios of common stocks in terms of the average price-earnings ratio.He wishes to determine if there is a difference between the two portfolios. $$\begin{array} { | c | c | } \hline \text { Portfolio 1 } & \text { Portfolio 2 } \\\hline n _ { 1 } = 53 & n _ { 2 } = 50 \\\bar { x } _ { 1 } = 16.60 & \bar { x } _ { 2 } = 17.62 \\s _ { 1 } ^ { 2 } = 62.74 & s _ { 2 } ^ { 2 } = 127.95 \\\hline\end{array}$$ Calculate a 99% confidence interval.
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