Throughout the article ‘penehyclidine’ is misspelled as ‘penehcyclidine’.
The colours in Table 1 were accidentally omitted and this Table is printed here in its correct form.
Table 1. The data of Wang et al. laid out in a 2 × 2 table. Numbers in black are Wang et al.'s reported data; numbers in red offer an example of the single (more extreme) tail that they used in their one-tailed test. Numbers in blue represent a less extreme tail, the probabilities for which would be included in a two-tailed test.
The x-axis label and legend to Figure 2 were incorrectly reproduced. The x-axis title should read “Number of red balls”, and the legend should read as below. The Figure and Legend are printed here in their correct form.
The text in the second column, 3rd page of this paper  should read as follows:
This is the distribution obtained when performing binomial sampling without replacement; for example, the probabilities of obtaining 0, 1, 2, 3, 4 and 5 red balls from an urn of 15 red and 5 white balls.
The authors and publishers apologise for these errors.