Percentiles Flashcards
What is the Latin rood for 100?
Cent
What is the difference between Percent, as opposed to Percentile?
Percent is 100% perfection
Example: Making every shot/ getting every question correct
Percentile gives comparing ranges by the %ile
Example: If in the 50%ile, you could be 50% less than or greater than the average.
What is a percentile (formal definition)?
Fraction of the ordered scores that fall at or below a given score
What is a standard score? Provide Example
…..
What is the Middlescore in a Percentile?
50 ; 50%ile
What is the Range?Why?
100%ile …. Because data is always out of 100%
What shape is a percentile in a “Normal Distribution”?
Bell Shape
What is a disadvantage of percentiles?
It is easy for averages to change %iles, while skewed scores have a hard time changing %iles
What are advantages of percentiles?
….
What is the Interquartile Range?
The inner quartiles of 25% to 75%
How do you find the Interquartile Range
IQR = Q3-Q1
Finding PERCENTILE when given raw SCORE.
- Fraction AT OR BELOW ___ “something”?
- %ile is _ “something”?
1) Organize Data in Highest to Least
For AT OR BELOW certain score?
…Count up to the targeted score, how much?
….then, divide by (N) total of #’s there
For %ILE at certain score?
….Count how many times the score is shown
….Then, divide by (N) total of #’s there
Finding SCORE from PERCENTILE.
Example: What score do you need to be in the 33rd %ile?
Count = decimal %ile * (N)
…Multiply percentile and total number of #’s present
… Answer should be an integer
….Count up by that much, and that is the score.
EXAMPLE:
Count= (0.33) x (15) = 5
….count up 5 from lowest #
How would you find %ile of basket or the amount of baskets with a given %ile when given information on the cumulative frequency?
Finding %ile of basket?
… Divide ; ____Cumulative Frequency___
(N) # of baskets mad
… (N) can be found by highest amount of Cum. f.
OR complete total of frequency
Finding baskets with given %ile?
… %ile x (N ) = amount of baskets
