Flashcards

RMP

James Rowland Inglês 15 flashcards

Flashcards do conjunto (15)

1Validitywhether an instrument measures what it was designed to measure
2Reliabilitythe ability of the measure to produce the same results under the same conditions
3confounding variableextraneous factors that seem to cause a change in the dependent variable
4systematic variationdue to the experimenter doing something in one condition and not the other
5unsystematic variationfrom random factors that exist between experimental conditions
6skewlack of symmetry
7kurtosisPointiness (leptokurtic- positive) (platykurtik - negative flatter)
8rangehighest score - lowest score
9interquartile rangecut off top and bottom 25% and calculate range of the middle 50% of scores. deals with extreme scores
10deviancedifference between each score and the mean (score - mean)
11sum of squared errorssome deviations + and some -. square them so all positive. Total deviance squared
12variancesum of squared errors divided by degrees of freedom (N - 1). Or: the average squared deviations from the mean
13standard deviationsquare root of the variance - tells us how well the mean represents the sample data
14z-scoresallow us to compare two scores from different normal distributions by converting data set to have a mean of 0 and a standard deviation of one. z = score - mean divided by sd
15causalityfundamental difference between experimental and correlational research