A total of 613 questionnaires were collected, giving a confidence level of 95% and yielding a confidence interval of 4. Analysis was carried out using SPSS 12.0 software system for Windows. Descriptive statistics for each of the questions were obtained. The
Chi-square test was used to test the correlation between pea size and the amount of toothpaste placed on a toothbrush using recoded numbers combining the largest size with the medium-large size to achieve the minimum expected cell frequency of 5. This way
no assumptions were violated.