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frequency distribution-shows the partition of data into categories by frequency (5 people surveyed have a learner's permit)
frequency-like i have no idea how to describe this
classsssss
CLASS LIMITS-(lower/upper) the biggest/smallest in each class (18-21, upper21 lower18)
class boundaries-uhhh the numbers used to separate the classes but without the gaps created by class limits... (18-21 and 22-25, 21.5)
class midpoints-obvi
CLASS WIDTH- the difference between the lower limit of a class and the lower limit of the next class
--(maximum value-minimum value)/number of classes
constructing a frequency distribution (slightly obvious)
1-number of classes
2-class width
3-first lower class limit at minimum or below
4-list the other lower class limits, add class width
5-list in a column and "enter the upper class limits"
6-tally the classes to find the total frequency
--(pg 44)
RELATIVE frequency distribution
-relative frequency for a class=frequency for a class/sum of all
-percentage " " "=frequency for a class/sum of all *100
cumulative frequency distribution
-the frequency for each class is the sum of the frequencies for that class and all previous classes-- cumulative
NORMAL DISTRIBUTION
-think of a bell curve... starts low, increases to a maximum, decreases to a low again
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