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AP STAT last minute reminders:Multiple Choice:Answer EVERY question–you DO NOT lose points for wrong answersDo not waste too much time on one question. If you are getting stuck, skip it and come back at the endIf you do not know how to complete a problem, try to eliminate some answers before guessingFree Response:Do not leave anything blankoIf you get stuck, at least identify a relevant formula, state the test you would use and the conditions that go along with that test.Organize your work –make sure that your work is legible and that your thought process is easy to followReminders:Binomial vs. GeometricoBinomial refers to the probability finding a number of successes out of a fixed number of trialsoGeometric refers to the probability of getting the first success on a particular trialPDF vs.CDFoPDF refers to the probability of a particular outcomeUsed with binomial, geometricoCDF refers to a cumulative probabilityFor normal and t distributions you can set the upper and lower boundFor Chi2it automatically calculates the area above that given valueFor binomial and geometric it automatically calculates the area below the given value (inclusive)Degrees of FreedomoOne sample mean OR Matched Pairsdf = n-1oTwo sample mean (Independent samples)df = n1 + n2 –2oChi2GOFdf = number of cells –1oChi2Independence or Homogeneitydf = (number of rows –1)(number of columns –1)oLin Regdf = n-2
Conditionso1 proportionRandom/ RepresentativeSuccess/ Failure10% conditiono2 proportion (conditions 1-3 must be checked for EACH sample)Random/ RepresentativeSuccess/ Failure10% conditionIndependent sampleso1 meanRandom/ RepresentativeNearly Normal (show histogram)population is approximately normal OR large sample size so the CLT states the samplingdistribution is approximately normal10% conditiono2 mean (conditions 1-3 must be checked for EACH sample)Random/ RepresentativeNearly Normal (show histogram)population is approximately normal OR large sample size so the CLT states the sampling distribution is approximately normal10% conditionSamples are independentomatched pairs1 -to -1 relationship between samplesRandom/ RepresentativeNearly Normal (show histogram)population is approximately normal OR large sample size so the CLT states the sampling distribution is approximately normal10% conditionoChi2Two categorical variables with datain countsRandom/ RepresentativeExpected cell frequencies of at least 5 (show table of expected values)oLin RegStraight enough (Show scatterplot of original data)Equal variance and random scatter in residual plot (Show sketch of residual plot)Nearly normal (Show sketch of histogram for residuals)