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PSY 121 Exam 2 Questions and Correct Answers
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PSY 121 Exam 2 Questions and Correct Answers
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PSY 121 Exam 24 types of measurement - Answer-nominal, ordinal, interval, ratio
Nominal - Answer-lowest level of measurement, a naming scale, their only property is identity /
categorizing ex: 1=male 2=female
most commonly used statistical test for nominal data - Answer-chi square
what type of data do nominal scales produce - Answer-frequency data
ordinal scales - Answer-used to measure a variable in order of magnitude, involve magnitude and
identity. ex: ranking grades a,b,c,d
what type of data do ordinal scales produce - Answer-ordered data
interval scales - Answer-give both the order AND the distance between values ex: temperatures
examples of interval scales in psychology - Answer-iq test scores, neuroticism scores, attitude measures
what type of data do interval scales produce - Answer-score data
, ratio scales - Answer-have all the properties of preceding scales but have a true zero point ex: weight
time distance volume
operational definitions - Answer-procedures used by researches to measure and manipulate variables
ex to operationally define weight
operationally define anxiety - Answer-heart rate, self report on anxiety level, behavioral observation of
avoidance behavior
operationally define obesity - Answer-the pinch test, a measure of fat folds at waist, volume of water
displaced, comparison of participants height weight ratio against standard charts
operationally define intelligence - Answer-score an IQ test, judgement by others of persons ability to
solve problems, grades in school
reliability - Answer-the consistency of measures
when should interrater reliability be used? - Answer-whenever the measure is a rating or a judgement
interrater reliability - Answer-if measure involves behavior observings and ratings 2 or more raters view
the subject and rate their behavior, then compare their ratings
how to prevent poor interrater reliability - Answer-train all of the observers the same,
test retest reliability - Answer-testing the same individual more than once in the same period of time
what kind of data is interrater reliability used for - Answer-nominal
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