A. Multiple Choice. Choose the letter of the best answer. 1. Statistically, the spread or scatteredness of observations in a data is called a. discriminant b. dispersion c. range d. standard deviation 2. The mean of the squared deviations of some observations from their arithmetic mean is called a. standard deviation b. variation c. median d. mode 3. The positive square root of the mean of the squared deviations of some observations from their arithmetic mean is called a. standard deviation b. variation c. median d. mode 4. Sum of the deviations of a variable from its mean is always a. i] b. 1 c. 2 d. 5 5. The measures that are used to determine the degree or extent of variation in a data set are called a. mean b. median c. measures of dispersion d. measures of central tendency _6. The variance of a sample of 81 observations equals 64. The standard deviation of the sample equals a. 0 b. 4096 c. 8 d. 6561 7. Which of the following is not a measure of dispersion a. range b. 50'\" percentile c. standard deviation d. variance 8. If the variance of a data set is correctly computed with the formula using n - 1 in the denominator, which of the following is true? a. the data set is a sample b. the data set is a population c. the data set could be either a sample or a population d. the data ls from a census _9. The measure of dispersion that is inuenced most by extreme values is a. variance b. standard deviation c. range d. interquartile range _10. The descriptive measure of dispersion that is based on the concept of a deviation about the mean is a. range b. interquartile range it. both and b d. standard deviation