EDMS 451 Study Guide - Final Guide: Technology In Revelation Space, Percentile, Histogram

• School: University of Maryland
• Department: Measurement, Statistics, and Evaluation
• Course: EDMS 451
• Professor: Greg Hancock

Document Summary

If sig value is greater than alpha level, equal variance assumed, reject null. If sig value is less than alpha level, equal variance not assumed, retain null. If sig 2-tailed is greater than alpha level, no statistically signi cant. If less than alpha level, statistically signi cant difference. Rejecting the null when it is actually true (false positive). I infer from my study that an sat prep course appears effective when it is actually not helpful. Type ii: retaining the null when it is actually false (false negative). I infer from my study that an sat prep course is not effective, when it actually is helpful. Nominal: each number represents a diff. name or category. Ordinal: numbers have nominal scale properties and the numerical order of scores represents order with respective to the attribute being measured. Class rank (gaps in between numbers aren"t equal) Interval: numbers have ordinal and nominal scale properties and differences between scale units are equal.