PSY 2116 Study Guide - Midterm Guide: Interval Ratio, Likert Scale, Statistical Inference
Document Summary
Levels of measurement: binary: consists of 2 categories. Dead or alive: nominal: more than two categories. Taste in music: pop, jazz, hip hop, rap ect : ordinal: categories have logical order. Interval: equal intervals on variables represent equal differences in the property of being measured. Likert scale variable, temperature: ratio: similar to interval however, ratio must make sense, measure has meaning. Validity: whether an instrument measures what it set out to measure. Reliability: whether a measure produces the same results in the same condition. Descriptive statistics: statistical procedures used to desribe the population/ sample that is being examined. Inferential statistics: statistical procedures used to make inferences or predictions about a population from observations and analyses of a sample. Look at distribution of scores in two ways: Characteristics: bell shape with majority of scores in the centre. When distribution deviates it is generally from lack of symmetry (skew) and lack of pointiness (kurtosis)
