.3. The Nature's way vitamin company sells vitamin tablets that claim to have less than 500 mg of vitamin C. A sample of 25 tablets has a mean of 492mg, and a standard deviation of 19.5. Assume that the population is normally distributed. The value of the standardized test statistic is (1 Point) O z = -2.051 O z = -2.751 O t= -2.051 O t = -2.751