Instatistics, what does dfdenote? If a simple random sample of 19 speeds of cars on California Highway 405 is to be used to test the claim that the sample values are from a population with a mean greater than the posted speed limit of 65mi/h, what is the specific value ofdf?

Choose the correct answer below. O A. df denotes the distribution of freedom. For this sample, df = 19. O B. df denotes the number of degrees of freedom. For this sample, df = 18. O C. df denotes the distribution of freedom. For this sample, df = 18. O D. df denotes the number of degrees of freedom. For this sample, df = 19