what are levels of measurements and what are the three levels
Quantitative data can be organised into different levels and these levels determine how precise the data is. The higher the level, the more precise the data is
nominal
ordinal
interval
what is nominal data
can be organised into categories data
discrete data
can only use the modal value
what is ordinal data
data that can be ordered or ranked (e.g. test scores, IQ, self-report scales)
intervals between each number are not equal
isn't very precise as the orders are subjectively decided by the researcher
due to this is it called 'unsafe' data
can use the median, mode and range
what is interval data
data that follows accepted units of measurement and has equal intervals
most precise level of data
parametric statistical tests can only use interval data
can use mean, median, mode, range and standard deviation
what are statistical tests used for
used to determine whether results were simply due to chance or they would happen if we repeated the study
they generate calculated values that we can compare against pre-made tables of values (known as critical value tables
