You want to look at the relationship between pupils’ responses to the item ‘I think I’m good at maths’ and their grades in maths. Which method do you use and why?
What will be an ideal response?
To answer this question we need to consider what types of variables we are using. ‘I think I’m good at maths’ is an ordinal variable, while grades in maths is a continuous
variable. The rule when we have two variables of a different level of measurement is that we need to use the method suitable for the variable at the lower level of measurement. In
this case that is the ordinal variable ‘I think I’m good at maths’. The measure we use to look at the relationship between two ordinal variables is the Spearman’s Rho rank-order correlation coefficient, so we will use this to look at the relationship between an ordinal and a continuous variable as well.
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