| English | Welsh |
| one-sided test | prawf un ochr (A test in which the null hypothesis is rejected if the value of the test statistic falls into a specific tail of the probability distribution (e.g. the test statistic must be greater than a critical value in order to reject the null hypothesis)) |
| one-tailed test | prawf un gynffon (A test in which the null hypothesis is rejected if the value of the test statistic falls into a specific tail of the probability distribution (e.g. the test statistic must be greater than a critical value in order to reject the null hypothesis)) |
| test file | ffeil brawf (A file used as part of a testing process to check the validity or correctness of a program or procedure) |
| two-sided test | prawf dwy ochr (A test in which the null hypothesis is rejected if the value of the test statistic falls into either tail of the probability distribution (i.e. is either less than a first critical value or greater than a second critical value)) |
| two-tailed test | prawf dwy gynffon (A test in which the null hypothesis is rejected if the value of the test statistic falls into either tail of the probability distribution (i.e. is either less than a first critical value or greater than a second critical value)) |
