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  2. Ratio estimator - Wikipedia

    en.wikipedia.org/wiki/Ratio_estimator

    The ratio estimator is a statistical estimator for the ratio of means of two random variables. Ratio estimates are biased and corrections must be made when they are used in experimental or survey work. The ratio estimates are asymmetrical and symmetrical tests such as the t test should not be used to generate confidence intervals.

  3. Methods of computing square roots - Wikipedia

    en.wikipedia.org/wiki/Methods_of_computing...

    A method analogous to piece-wise linear approximation but using only arithmetic instead of algebraic equations, uses the multiplication tables in reverse: the square root of a number between 1 and 100 is between 1 and 10, so if we know 25 is a perfect square (5 × 5), and 36 is a perfect square (6 × 6), then the square root of a number greater than or equal to 25 but less than 36, begins with ...

  4. How Much Does it Cost to Replace a Roof? - AOL

    www.aol.com/much-does-cost-replace-roof...

    The typical roof replacement will range between $4 to $11 per square foot. The higher the square footage, the more your roof replacement will cost. For a 1,500 square foot roof, homeowners can ...

  5. Roof insurance: ACV vs. replacement cost - AOL

    www.aol.com/finance/roof-insurance-acv-vs...

    For example, if the replacement cost — not the amount that you paid for it originally, but the amount it would cost to replace it today — for your roof is $20,000, but the roof loses 5 percent ...

  6. Flat roof - Wikipedia

    en.wikipedia.org/wiki/Flat_roof

    A study by Ducker International in 2005 identified the average cost per year of a metal roof to be US$3.2 per square metre ($0.30/sq ft) while single-ply roofs stood at $6.1/m 2 ($0.57/sq ft) and built-up roofing at $4.0/m 2 ($0.37/sq ft).

  7. Newsvendor model - Wikipedia

    en.wikipedia.org/wiki/Newsvendor_model

    – fixed cost. This cost always exists when the production of a series is started. [$/production] – variable cost. This cost type expresses the production cost of one product. [$/product] – the product quantity in the inventory. The decision of the inventory control policy concerns the product quantity in the inventory after the product ...

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