A study will be conducted to investigate whether there is a difference in mean tail lengths between two populations of snow leopards. Random samples of leopards will be selected from both populations, and the mean sample tail length will be calculated for each sample. Which of the following is the appropriate test for the study? A A two-sample t-test for a difference between population means Submit B A two-sample z-test for a difference between population proportions с A one-sample z-test for a population proportion D A one-sample t-test for a sample mean E A one-sample t-test for a population mean