Stat

1.5IQR rule
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Terms in this set (26)
1.5IQR rule
Q1-1.5(IQR)
Q3+1.5(IQR)
socs
shape, outliers, center, spread
resistant vs nonresistant measures of spread and center
median is resistant
standard deviation, mean, and range are nonresistant
normal curve sections
34.13, 13.59, 2.28
convenience sample
easiest to reach
voluntary response
individuals choose to respond
simple random sample (srs)
every member has equal chance (rng)
stratified random sample
do srs within strata
cluster sample
select groups and survey all in that group
systematic sample
pick every nth individual
undercoveragemiss a group because you cannot reach themnon-responseindividuals don't respond by choicebiaspoor questions/leading questionslurking variableseffects the explanatory and response variableconfounding variableeffects just the response variable, but is related to the explanatoryexperiments must have these three elements1. control 2. randomization 3. replicationsblockingreducing the effects of known attributes of the subjects that cannot be changed (stratified random sampling)matched pairs designeach person is a block and gets both treatments (accounts for individual variability)P(A∪B)P(A∪B) = P(A) + P(B) *** if mutually exclusive, otherwise subtract overlapP(A∩B)P(A)*P(B) *** if independentP(A|B)P(both)/P(B)events are independent when...P(A|B) = P(A)binomial mean and standard deviationµ = np, σ = √(npq)geometric mean and standard deviationµ = 1/p, σ = √(q/p^2)normal approximation can be used whennp>10 & nq>10varianceσ^2