In forming a confidence interval for 
,only two assumptions are required: independent samples and sample sizes of at least 30.
Definitions:
Portfolio Beta
A measure of the volatility of a portfolio in comparison to the market as a whole.
Risk-Free Asset
An investment with a guaranteed return and no risk of financial loss, typically represented by government bonds.
Expected Return
The average return on an investment calculated by multiplying each possible outcome by its probability and then summing all these values.
Market
A place or mechanism through which buyers and sellers interact to trade goods, services, or financial instruments.
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