Lots and lots of statistics

Today we practised two more statistical tests - Chi squared and Mann-Whitney.

The chi-squared test is used when the hypothesis predicts a difference or an association between two conditions, when the data is nominal (categoric) and when the categories used are independent of each other.

The two chi-squared worksheets are here and here. See me if you need the past paper question and mark scheme on this topic as it's old style copy and paste ie not electronic (likewise for the answer sheet to the worksheets).

The Mann-Whitney test is used for independent groups designs. The data needs to be ordinal or interval or ratio and the hypothesis needs to predict a difference between two sets of data.

The step-by-step worksheet for Mann-Whitney is here and the second example sheet is here.

I also briefly talked about types of data and this handout should clarify matters.