ECH-3023 Lecture 2: Week 2 Lecture 2 - Estimation to Basic Statistics
11 Sep 2016
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Identify commonly used units and convert them (conversion factors) b. Identify number of significant figures: validate a quantitative problem solution, calculate sample mean, range, variance, and standard deviation, explain concept of dimensional homogeneity and dimensionless quantities, do interpolation and extrapolation, curve fit data. In the american engineering system? m/s, cm/s, ft/s e. ii. Convert 23 (lb_m*ft) / (min)^2 to its equivalent in kg*cm/s^2. [23 lb_m*ft/min^2] * [0. 453592 kg / 1lb_m] * [100cm / 3. 281 ft. ] * [1^2 min^2 / 60^2 s^2] = 0. 088 kg*cm/s^2 (2 sig figs. Conversion factors found in the book. : number of sf provide indication of precision in the data. f. i. When 2 or more quantities are combined by multiplication and/or division, the number of sf in the result should equal the lowest number of sf of any of the multiplicands or divisors. f. ii. When 2 or more numbers are added or subtracted, the positions of the last.
