What z-value corresponds to the 18th percentile?
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion to give you that Z score.
(Hint: it should be negative and close to 2.)
To find the z-value corresponding to a given percentile, you can use the standard normal distribution table or a statistical calculator. Here's how to find the z-value for the 18th percentile:
1. First, find the standard normal distribution table or use a statistical calculator that provides z-scores.
2. Locate the row that corresponds to the nearest value to 0.18 in the table (or enter 0.18 into the calculator).
3. Read the corresponding z-score from the leftmost column or from the output of the calculator.
The z-value corresponding to the 18th percentile is approximately -0.94.