This data set has 125 observations in it. From these simple
frequen-cies we can calculate what the expected count in each condition
should be. For instance, the first row contains 20 + 25 = 45
observations, and the first column contains 20 + 50 = 70 observations;
thus we would ex-pect to find, in the first (Low-Fail) cell,

where *Ti* is the total number of observations for the row,
*Tj* is the total for the column, and *N* is the total
number of observations. Thus we expect the cell to contain 25.2
observations. The same calculations can be done for all cells, resulting
in the table of expected frequencies, shown in Table A.5.