Collocations are characteristic, co-occurence patterns of words. The table below shows the intercorrelations between can, could, may, might, must, ought and shall taken from the table above. The closer the score is to 1, the better the correlation between the two variables. The relationship between can and can is 1, as they are identical.
Parametric tests make certain assumptions about the data on which the test is performed.
Thirdly, parametric tests make use of parameters such as the mean and standard deviation. Non-parametric tests make no assumptions at all about the population from which the data is drawn. Knowledge of parameters is not necessary either. These tests are generally easier to learn and apply. The probability of this happening is the same as the significance level of the test.