Which of the following is not true regarding standard deviation? O A. Standard deviation measures the amount of variation (or spread) in the sample. O B. If all of the values in the data sample are the same, the standard deviation is 0. O C. Standard deviation is a measure of center. O D. Standard deviation describes the consistency of the data values; how close they all are with respect to the mean. Which of the following descirptive statistic measures the Central Tendency of a sample? O A. z-score O B. range O C. standard deviation O D. mean Which of the following descriptive statistic measures the Variation in a sample? O A. z-score O B. standard deviation O C. mode O D. mean Which of the following descriptive statistic measure how one data value compares to the rest of the sample? O A. range O B. z-score O C. mean O D. standard deviation