1. Which measures of variability is considered most unreliable? * A. Range B. Variance C. Mean Absolute Deviation D. Standard deviation 2. What refers to the average of the squared deviations from the mean? A. Co-efficient of variation B. Variance C. Mean Absolute Deviation D. Standard deviation
Because the range does not consider all the scores in the distribution, it often does not give an accurate description of the variability for the entire distribution
2.D.Standard Deviation
The average squared deviation from the mean isalso known as the variance
