Home – Chapters 1 · 2 · 3 · 4 · 5 · 6 · 7 · 8 · 9 · 10 · 11 – Sections 1-2 · 1-3 · 1-4 & sgNotes1
Click a section number to see examples for that section. Click sgNotes for lecture notes.
Chapter 1 Notes by Steven Grindle
Previous page – Page 4 – Next page
Classifying the type of measurement is important also. Four levels of measurement are: nominal, ordinal, interval or ratio. There are subtle distinctions between the data types but the type we will use for the majority of this course is ratio.
Examples from 1-2 page 10 Link to questions
Choose the appropriate measurement level.
#13 Numbers on the shirts of marathon runners
are nominal because the numbers are labels and cannot be ranked or used for any mathematical purpose.
Examples continued Link to questions
#15 Social Security Numbers
are nominal because the numbers identify individuals. SSN's cannot be ranked and do not serve any mathematical purpose.
#17 The years of Cicada emergence 1936, 1953, 1970, 1987, 2004
are interval because the difference betwen the numbers is meaningful but the ratio and the zero point are meaningless.
#19 Movie ratings of 1 star, 2 stars, 3 stars
are ordinal because the ratings can be ranked but no mathematical operations are meaningful.