A group of students taking Bir 2405 embarked on a study of their professor's claim that "the mean weight of witches is the same as ducks." A previously unstudied population, witches were difficult to find and there was no knowledge of the weights nor of the variance of weights of witches. The group took independent random samples of witches and ducks. Assume normally distributed populations. The students observed witches seem to float and weigh less than one might expect. So they structured their null hypothesis to assume there is no difference between the mean weight of witches and ducks. (H0:1y=0) The sample statistics are as follows. Step 1 of 3: The test statisticis (fround your answer to 3 decimal places.)