SOAN 3120 Lecture Notes - Lecture 2: Interquartile Range, Central Tendency, Squared Deviations From The Mean

• School: University of Guelph
• Department: Sociology and Anthropology
• Course: SOAN 3120
• Professor: Ryan Broll

Document Summary

The concept of central tendency: most t(cid:455)pi(cid:272)al, (cid:272)e(cid:374)tral or (cid:272)o(cid:373)(cid:373)o(cid:374) s(cid:272)ore of a (cid:448)aria(cid:271)le. Useful because they reduce a large amount of information to one single number: three (cid:373)easures: Mean: average score: mode, (cid:373)edia(cid:374), a(cid:374)d (cid:373)ea(cid:374) are three (cid:448)er(cid:455) differe(cid:374)t statisti(cid:272)s, var(cid:455) i(cid:374) ter(cid:373)s of: The concept of dispersion: variet(cid:455), di(cid:448)ersit(cid:455), a(cid:373)ou(cid:374)t of (cid:448)ariatio(cid:374) (cid:271)et(cid:449)ee(cid:374) s(cid:272)ores, greater the dispersio(cid:374) of a (cid:448)aria(cid:271)le, the greater the ra(cid:374)ge of s(cid:272)ores a(cid:374)d the greater the differe(cid:374)(cid:272)es between scores. Tells us about the diversity/variation within the scores = dispersion. The greater the amount of dispersion, the greater the range between scores. Or was the average 70 and half the class failed and the other half got 90% If everyone had the same score it would be a straight line and there would be no dispersion = everyone scored 70 in a test. ,000 in 2011) than canadians (,000 in 2011) Measures of central tendency and dispersion for nominal variables.