1. The more dispersed the data are, the larger the range, the interquartile range, the variance, and the standard deviation will be. True or false? Explain.

2. If a set of data contains observations that are all the same, the range, the interquartile range, the variance, and the standard deviation will all be 0. True or false? Explain.

3. Can the values for the range, the interquartile range, the variance, and the standard deviation ever be negative? Explain.

4. What measure of variability can be used to compare variables when they have different units of measurement?