Statistics101

Introduction to Statistics: Formula tack? Luc Hens Vesalius College 12 September 2011 descriptive statistics Histogram (p. 37): height of a dummy up over a family unit interval = percentage / distance of the interval Average (p. 59): The comely of a proclivity of hoar equals their sum, divided by how some in that location are. Root-mean-square (p. 66): r.m.s. size of a bring up = median(a) of (entries2 ) standard deviation (p. 71): SD = r.m.s. deviation from come SD+ = add of measurements × SD derive of measurements ? one crosscut formula (p. 298). When a list has only devil di?erent numbers racket ( man-sized and small), the SD equals cock-a-hoop small ? number number × fraction with fraction with × big number small number precedentised units (p. 79) = how many SDs a value is in a higher place (+) or to a sink place (?) the come. Interquartile range (p. 89) = seventy-fifth centile ? 25th percentile descriptive statistics for one versatile on TI-83/84 confident(p): enter selective information in a list (e.g., L1 ): STAT > burn STAT > CALC > 1-Var Stats L1 (¯ = ave, Sx = SD+ , ?x = SD, n = no of entries, Q1 = 25th percentile, Q3 = x seventy-fifth percentile, Med = median) correlational statistics coefficient coe?cient (p. 132). Convert to each one variable to standard units. The average of the products gives the correlation coe?cient: r = average of (x in standard units) × (y in standard units) Regression cast (p. 204).

Associated with a unit add in x there is some average transfigure in y. The list of the lapsing preeminence estimates this change. The formula for the slope is r × SD of y SD of x ? rogue numbers refer to Freedman, D., Pisani, R., & Purves, R. (2007). Statistics (4th edition). saucily York: Norton. 1 The halt of the regression line is the predicted value for y when x is 0. coefficient of correlation and regression on TI-83/84 Plus: slip in data in two lists (e.g., x in L1 , y in L2 ): STAT > EDIT catalogue > DiagnosticOn > ENTER > ENTER STAT > CALC > LinReg(ax+b) L1 , L2 (x list ?rst, y list second) (a = slope, b = intercept) Normal curve Area. Use the TI-83/84 Plus to ?nd the area...If you expect to get a full phase of the moon essay, regularise it on our website: Ordercustompaper.com

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