# collier test 5

 Ratio Real measurementsex. height, weight, speed, velocity, mass, area, volumethere is a true 0 pointthis means that division and multiplication are meaningfulexperimental psychology tends to use ratio measurements Experimental psychology ratios accuracyreaction timeheartratebrain wavesresponse rates of pigeon or rate in a Skinner box Interval quantitative variablelike ratio measurementThere is NO true 0 pointSums and differences are meaningful, but not multiplication and division (ratios) Interval examples temperature scales, including Celsius and FAhrenheitclock or calender time, because we dont know when time started Interval level measurements In testing, personality and social psychology we frequently use questionnaire and test responses such as Liket (agree-disagree) scalesusually convert these to numbers and use math on them, so we are treating them as interval scales.may be considered ordinal scales Nominal categories without orderthere are no numberssometimes we use numbers as categoriesex. social security numbersnumbers on football jersiestelephone numbers how do you do statistics with nominal variables it requires a trick, count the number of items in each category Ordinal Ordered categoriesfreshman, sophomore, junior, seniorNominal and ordinal are similarthe distances between each point are not neccessarily equal Levels of measurement have a natural order, from strong to weak Strong: Ratio; Interval (quantitative)Weak: Ordinal;Nominal (qualitative/catergorical) Permissible operations all levels of measurement have certain mathematical operations that are allowed, and others that are not allowed Permissible operations: Ratio variables Multiplication and division (ratio) operations ar permitted because there is a true 0 point Permissble operations: Interval variables addition and subtraction ar allowed, but not division and multiplication Permissible operations: ordinal variables comparison of less and more are allowed, but not the other mathematical operations Permissible operations: nominal variables comparison of same or different are allowed, but not less or more, or any other mathematical operations Demotion Involves throwing away informationex Rank height Promotion Involves adding information that you dont haveex. GPA calculator Norm Referencing each score is compared to the average of a reference groupgrading on a curve is an applicationex IQ testsĀ SAT, GREPersonality inventories Criterion referencing each score is compared to an absolute standardthese are generally used when absolute performance levels are setEx. DMV written examsState K-12 testing (No Child Left Behind)PACT Percentile it depends on how many ppl took the test to determine how good the rank is Standard scores obtained from raw scores by converting the distribution to one with a new mean and standard deviationZ scores are the most common Z scores once z score is obtained we can convert this to a percentile by looking up the z scored on a table of the normal distibution grade equivalents publishers cheatbased on z scores for the same school grade, not different school grades SEM standard error of measurementtest scores vary randomlyppl test scores may vary from their true scoresmeasures how far a test score is likely to be from the true score (it is a kind of standard deviation of measurment) True score a real score that would be obtained by giving the test over and over again and averaging the results Authorbrittanyball42 ID180759 Card Setcollier test 5 Descriptioncollier test 5 Updated2012-11-05T15:15:41Z Show Answers