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25 Cards in this Set

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quantitative
data with mesurements in numbers
qualitative
data theat can be classified into different groups or categories
categorical
data that can be classified into different groups or categories
univariate
data with onely one measurement on each object
bivariate
data with two measurements on each object
n
number of observations in data set
frequency
number of times in a data set the observation occurs
f
frequency
relative frequency
ratio of frequency to the total number of observations
rf
relative frequency
equation for relative frequency
rf=f/n
cumulative frequency
number of observations less than or equal to a specified value
cf
cumulative frequency
frequency distribution table
table gving all possible values of data and their frequencies. RF, CF, midpoints of group, etc. may be added to frequency distribution tables if needed
ungrouped frequency distribution table
table where data points are reported as they occurred, giving a list of all values
classes
wehn categories for data points are grouped by some scheme into certain categories
grouped frequency distribution table
table where data points are grouped into classes
class makrk
halfway betwen upper limit and lower limit (midpoint for class)
midpoint
1/2 way between upper and lower limit
true or false:
All RF from one distribution should add up to 1.
True
center distribution
describes the point around which the data points are spread
spread of distribution
describes how data points are spread, using range of data values and vasteness or narrowness of spread
symmetric distribution
if 1/2 of distribution is approx. a mirror image of hte other, then the distribution is symmetric. Same # of obserivations on each side of midpoint
left skewed disribution
longer tail on left. lesser half of distribuiton extends further than the greater half.
right skewed
greater half of distribution extends fruther out than lesser half. longer tail on right.