Answer parts a through c for a quantitative data set. a. What is the 50th percentile called? b. Define QL. c. Define QU.
Z-score
b. Which statement below defines QL?
A. The lower quartile, QL, is the z-score one standard deviation below the mean.
B. The lower quartile, QL, is the 25th percentile of a data set.
C. The lower quartile, QL, is the 75th percentile of a data set.
D. The lower quartile, QL, is defined to be exactly half of the median.
c. Which statement below defines QU?
A. The upper quartile, QU, is the 75th percentile of a data set.
B. The upper quartile, QU, is the 25th percentile of a data set.
C. The upper quartile, QU, is defined to be exactly two times the median.
D. The upper quartile, QU, is the z-score one standard deviation above the mean.