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Chapter 4: Measures of Position
159
Again, we can use the
Basic Statistics
workbook to compute the answer.
The output is given in
Figure 4-10
. Note the data was entered in the Data 2
column.
Figure 4-10:
Computed percentile for
Example 4-5
In the previous discussions, we described a procedure for finding the
percentile ranking for a given data value. Next we will discuss the inverse
process. That is, if we were now given the percentile ranking of a data
value, what process should we use to find that data value.
Procedure for Finding a Data Value for a General Percentile
P
k
Assume that we want to determine what data value falls at some general
percentile
. The following steps will enable you to find a data value for a
given general percentile
for a data set.
Step 1:
Order the data set from the minimum value to the maximum value.
Step 2:
Compute the position number
of the percentile. To compute the
position number, use the following formula.
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