[Solved] Two independent samples of sizes 40 and 50 are randomly selected from two populations to test the difference between the population means \(\mu _ { 1 } - \mu _ { 2 }\) . Assume the population variances are known. The sampling distribution of the sample mean difference \(\bar { x } _ { 1 } - \bar { x } _ { 2 }\) is: A)normally distributed. B)approximately normal. C)Student t-distributed with 88 degrees of freedom. D)None of these choices. Microbiology: The branch of science concerned with microorganisms and their effects on other living organisms. Surface Anatomy: The study of the external features of the body and their relationship to deeper structures, as visible to the naked eye without dissection. Organelle: Specialized structures within a cell, each performing specific functions necessary for the cell's life, such as mitochondria, the Golgi apparatus, and the nucleus. Tissue Types: Categories of tissues in the body, including epithelial, connective, muscle, and nervous tissues, each serving specific functions.