STAT151 Lecture 3: 03 Ch 2.pdf

• School: University of Alberta
• Department: Statistics
• Course: STAT151
• Professor: Alireza Simchi

Document Summary

Recall: data can be numbers, record names, or other labels. Not all data represented by numbers are numerical data (eg. 1 = male, 2 = female) It must have the five w"s : who, what, when, where, and. Subjects or participants people on whom we experiment: the entire set of subjects is the population, the set of subjects you observe is your sample. Respondents individuals who answer a survey. Experimental units animals, plants, and inanimate subjects. Variables are characteristics recorded about each individual: a variable can take different values for different individuals, some variables have units that tell how each value has been measured and tell the scale of the measurement. Numerical (quantitative: a categorical variable places a subject into one of several groups or categories (or levels). (cid:190) usually we determine the counts of cases that fall into each category. 2 of 6 (cid:190) two types: nominal: the levels have no order, ordinal: the levels have some order.