# Stats Ch. 3

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- Oklahoma
- University of Oklahoma
- Statistics
- Statistics 2113
- Fife
- Stats Ch. 3

**Created:**2012-01-23

**Last Modified:**2012-02-13

- number of time a score appears
- symbolized by "f"

- shows the number of times each score occurs in a set of data
- found by counting how many times the score appears
- if three participants scored 6, then frequency of 6 is 3

- use when you have a nominal or ordinal data set
- adjacent bars do not touch
- thus, the x variable is discrete

- use when plotting a frequency distribution containing a small number of different ratio or interval scores
- adjacent bars touch because the data is continuous

- use when plotting a frequency distribution containing a large set of different ratio or interval scores
- measurements are continuous

- aka normal distribution
- can't label y axis with specific frequencies
- higher the curve is above the score, the higher the score's frequency
- never touches x-axis
- score with the highest frequency is in the middle
- curve is symmetrical
- extreme scores are tails

- has extreme low scores that have low frequency
- does not have low frequency, extreme high scores
- bump is on the right

- contains extreme high scores that have a low frequency
- does not contain low frequency, extreme low scores
- bump is on the left

- a symmetrical distribution containing two distinct bumps, each reflecting high frequency scores
- ex. on a test most students score a 70 or 90, with fewer 60 or 80s

- shaped like a circle. jk. jbf. it is a rectie!
- ex. 2 students get As, 2 get Bs... etc

- a graph shows this
- to find this with a set of data, 1st make a simple frequency table
- ex.

6 1 .05

- frequency of all scores at or below a particular score
- written as cf

- the percent of all scores in the data at or below a certain score
- so, if the score of 80 is at the 75th percentile, this means that 75% of the sample scored at or below 80

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