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In a study on the effects of caffeine on memory one group of participants drank a bottle of tasteless water containing 100, 50, or 0 milligrams of caffeine. Another group of drank a bottle of water with no caffeine. The participants assigned to the group that got bottled water with no caffeine represents the _____ in this study.
Standard Deviation
A statistic that measures the dispersion of a dataset relative to its mean and is calculated as the square root of the variance.
Stock A
A generic term used to represent a share in the ownership of a company, typically entitling the shareholder to a portion of the profits.
Mean-Variance Efficient Portfolio
A portfolio constructed to have the highest possible expected return for a given level of risk.
Covariances
A measure of how two variables move in relation to each other, indicating the degree to which they vary together.
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