MAS 201 Lecture Notes - Lecture 2: Pie Chart, Categorical Variable, Bar Chart

• School: University of Miami
• Department: Management Science
• Course: MAS 201
• Professor: Mc Kenry Mary

Document Summary

Presenting data in tables and charts numerical data. Stem and leaf diagram: break up (cid:374)u(cid:373)(cid:271)er i(cid:374)to (cid:862)ste(cid:373)(cid:863) a(cid:374)d (cid:862)leaf(cid:863) a(cid:374)d pla(cid:272)e o(cid:374) diagra(cid:373, create se(cid:272)o(cid:374)d diagra(cid:373) where (cid:862)leaf(cid:863) portio(cid:374)s are i(cid:374) (cid:374)u(cid:373)eri(cid:272) order. Skews: positively skewed is when tail is on right, negatively skewed is when tail is on left, bell curve is normal/no skew. Between 5 and 15: approximate width of groups. Width is range/desired # of groupings: class boundaries. Cumulative distribution: cumulative frequency distribution, cumulative percentage distribution. Graphical representations of frequency distributions: histogram, frequency polygon and percentage polygon, ogive- cumulative % polygon. Cross-tabulation tables- tabular summary of data for 2 variables. Scatter diagram is a graph describing two numerical variables: looking for relationships between the 2 variables. If one variable is considered dependent it should be graphed along the y-axis. Care should be given to the scale (easy to distort the strength of relationship by changing scale)