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When school finances are limited, the cost-benefit test any educational policy must pass is not “Does this policy have any positive effect?” but rather “Is this policy the most productive use of these educational dollars? that directly compares CSR to specific alternative investments, but one careful analysis of several educational interventions found CSR to be the least cost effective of those studied.
This average is weighted with respect to the number of shares acquired at each price, and not just the absolute price.
Weighted averages show up in many areas of finance besides the purchase price of shares, including portfolio returns, inventory accounting and valuation.
When a fund, which holds multiple securities, is up 10 percent on the year, that 10 percent represents a weighted average of returns for the fund with respect to the value of each position in the fund.
For inventory accounting, the weighted average value of inventory accounts for fluctuations in commodity prices, for example, while LIFO () methods give more importance to time than value.
We examine “what the research says” about whether class-size reduction has a positive impact on student learning and, if it does, by how much, for whom, and under what circumstances.
Despite there being a large literature on class-size effects on academic achievement, only a few studies are of high enough quality and sufficiently relevant to be given credence as a basis for legislative action.
Investors often build a position in a stock over several years.
Stock prices change daily, so it's tough to keep track of the cost basis on those shares accumulated over a period of years.
A weighted average is extremely useful in that it allows the final average number to reflect the relative importance of each observation and is thus more descriptive than a simple average.
It also has the effect of smoothing out data thereby enhancing accuracy.