When comparing two population variances, we use the ratio 
rather than the difference 
.
Definitions:
Portfolio Weight
The percentage composition of a specific asset in an investment portfolio relative to the total value of the portfolio.
Risk-Free Asset
A financial commitment that ensures a guaranteed profit without the possibility of monetary loss, often symbolized by state-issued bonds.
Expected Return
The weighted average of the probable returns of an investment, considering all possible scenarios.
Standard Deviation
A numerical indicator used in statistics to represent the extent of scatter among data points.
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