1) Approximately 2/3 of all data in a normal distribution is located how far from the mean?

2)This is the simplest measure of variability and dispersion; calculated by finding the difference between the lowest and highest values

3) Standard deviations can be negative. true or false

4)A z-score value far from zero indicates close proximity to the mean. true or false

5)When calculating variance why are deviations from the mean squared?

6)Measures of variability can be found for qualitative variables. true or false

7)These two graphics are similar with two distinct differences: 1)substantively, the variables in one show continuity 2)visually, the figures in one touch

8)This measure of variability and dispersion depicts the typical distance of a data value from the mean

9)We are comparing two data sets. They are equal in size and mean (for the variable in question). Group A has a larger range than Group B. Which group is more likely to have a higher standard deviation; why?

10)Z-scores can be negative. true or false

11)What graphic is best to display change over time?

12)Values must exceed how many standard deviations to be outside thenormal range?

13)Which of these are characteristics of a normal curve/distribution?

14)A probability distribution comes from theory and should resemble population parameters. true or false

15)What value does the sum of deviations always come to?