Question 86:
Asked on February 19, 2008
1
Answer:
No answer provided yet.Quartiles are just taking 100 percentage points and dividing by 4. So the 1st through 4 Quartiles are the 25th, 50th and 75th percentiles. If you wanted Quintiles, you’d divide by 5. For the z-score of the third quartile we just lookup .75 in the
Percentile to Z-score calculator , assuming it’s the two-sided area we’re interested in, the z-score is 1.15.
