Researchers weremeasuring the%change in range sizes of 42mammal species over a 50 year period. The values ranged from -14.6% (indicating a decrease of 14.6% in the range size) to +32.1% (indicating an increaseof 32.1% in the range size). On average, the mean % change across all the species was +6.3%. To test whether this result differed from the null hypothesis expectation that the mean change would be 0% what test should the researchers use?