The head accountant in a large corporation conducted a survey last year to study the proportion of incorrect invoices. Of the 2,000 invoices sampled, 25 were incorrect. To lower the proportion, he instituted a new system. A year later, he wants to know whether the new system worked. He collects 3,000 invoices and obtains 30 incorrect invoices. Can he argue that his new system has successfully lowered the proportion of incorrect invoices? Do a 5 % test.