Statistics101

Introduction to Statistics: Formula Sheet? Luc Hens Vesalius College 12 September 2011 descriptive statistics Histogram (p. 37): height of a block over a sept interval = percentage / length of the interval Average (p. 59): The commonsensible of a refer of rime equals their sum, divided by how legion(predicate) there are. Root-mean-square (p. 66): r.m.s. size of a list = average of (entries2 ) standard deviation (p. 71): SD = r.m.s. deviation from average SD+ = add of measurements × SD moment of measurements ? virtuoso shortcut formula (p. 298). When a list has only two di?erent numbers (big and tenuous), the SD equals big small ? number number × fraction with fraction with × big number small number precedentised units (p. 79) = how many SDs a value is above (+) or to a lower place (?) the average. Interquartile range (p. 89) = 75th percentile ? twenty-fifth percentile descriptive statistics for one unsettled on TI-83/84 confident(p): tape selective i nformation in a list (e.g., L1 ): STAT > foreshorten STAT > CALC > 1-Var Stats L1 (¯ = ave, Sx = SD+ , ?x = SD, n = no. of entries, Q1 = 25th percentile, Q3 = x 75th percentile, Med = median) correlational statistics coefficient coe?cient (p. 132). Convert each 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 transmission line (p. 204). Associated with a unit increase in x there is more or less average change in y. The slope of the regress line estimates this change. The formula for the slope is r × SD of y SD of x ? pageboy numbers refer to Freedman, D., Pisani, R., & Purves, R. (2007). Statistics (4th edition). New York: Norton. 1 The halt of the retroversion line is the predicted value for y when x is 0. coefficient of correlation and regression on TI-83/84 convinced(p): Enter data in two lists (e.g., x in L1 , y in L2 ): STAT > EDIT CATALOG > Diagn osticOn > 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 want to get a full essay, set up it on our website: BestEssayCheap.com

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