Quick reminder diff-rel-ind-gd of fit
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This document defines and compares different statistical concepts: difference compares results between groups like height of males vs females; relationship examines how a change in one variable relates to another like height and weight; independence assesses whether two variables are unrelated such as college admission and ethnicity; goodness of fit evaluates how actual results align with a hypothetical claim or expectation. It provides examples of comparing group averages or percentages to analyze differences, relationships, and goodness of fit.
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Quick reminder diff-rel-ind-gd of fit
- 1. DIFFERENCE compare the results (height) for one group (males) with the results of at least one other group (females). RELATIONSHIP deals with how an increase in one variable (height) is related to an increase or decrease in another variable (weight). INDEPENDENCE deals with how two variables (college admission and ethnicity) are NOT RELATED. GOODNESS OF FIT compare ACTUAL RESULTS with a CLAIM or a HYPOTHETICAL expectation. Central Tendency, Spread, or Symmetry? Group 1 height Group 2 height Difference? Individuals height Individuals weight College Admissions EthnicityNo relationship CLAIM: 9 out of 10 dentists recommend “X” ACTUAL RESULTS: Only 7 out of 10 dentists actually recommended “X” Note – generally you are comparing the average or percentage of one group with another group or population.