‘All numbers are intervals’
-not all numbers have equal gaps
‘Zero always means nothing’
-only some scales (not interval) have a true zero
‘Ordinal data can be used for all maths’
-you can only rank ordinal:data you cannot calculate mean or standard deviation accurately
‘Nominal data is unimportant’
-nominal data is still useful for counting, categorising, and comparing groups
‘Grades are interval’
-grades are usually ordinal because the difference between each grade isn’t exactly equal