[Solved] Which of the following statements is not true about the t- distribution? A)Like the normal distribution, the t- distribution is symmetric and unimodal. B)For small sample sizes, the t- distribution has all the same properties of the normal curve. C)Since population standard deviation is usually unknown, the standard error uses the sample standard deviation to estimate population standard deviation. The formula is SEest = s/ n. D)All of these statements about the t- distribution are true. Microscopic Organisms: Tiny life forms, not visible to the naked eye, including bacteria, protozoa, and certain types of fungi and algae. Calcium Carbonate: A chemical compound with the formula CaCO3, found in rocks such as limestone, chalk, and marble, and is a major component of shells of marine organisms, snails, and eggs. Chalk Formation: A type of soft, white, porous sedimentary rock composed mainly of calcite or aragonite, formed from the skeletal remains of microorganisms. Microscopic Organisms: Tiny life forms, often single-celled, that can only be seen with the aid of a microscope.