A pump manufacturer claims that a higher proportion of her Pumpo brand pumps will be operating without repairs in 5 years than those of a competitor. Records were examined of 100 pumps of each manufacturer put into service 5 years ago. 67 of the Pumpo pumps and 62 of the competitor's pumps were found still working without repairs. What calculated value would be used to test that the proportion of Pumpo pumps operating without repairs is higher than those of the competitor? Express your answer to 3 places of decimal. Find your difference by taking the Pumpo value minus the competitor value.