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Math
Statistics
stats quiz 1
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Terms in this set (36)
a numerical measurement that describes some characteristic of a population
parameter
a numerical measurement that describes some characteristic of a sample
statistic
numbers representing counts or measurements
quantitative data
this data can only take certain values
discrete data
discrete data can or can't have decimals
can't
continuous data can or can't have decimals
can
this data can take any value within a range
continuous data
discrete data is
counted
continous data is
measured
names or labels (representing categories) that are not numbers representing counts or measurements
qualitative data (categorical data)
name the four levels of measurements
nominal, oridinal, interval, ratio
data that consist of names, labels, or categories only, does not imply any odering among the reponses
nominal level of measurement
involves data that can be ordered, but differences between data values are meaningless
ordinal level of measurement
interval scales are numerical scales in which intervals have the same interpretation throughout, no natural zero starting point (whre none of the quantity is present)
interval level of measurement
interval level is modified to include the natural zero starting point (where zero indicates that none of the quantity is present), differences are meaningful
ratio level of measurement
each member of a population has an equal chance of being selected
random sampling
each member of a sample has an equal chance of being selected
simple random sampling
subdivide the population into at least 2 different subgroups that share the same characteristics and then draw a sample from each subgroup
stratified sample
divide the population into sections, randomly select some of those sections, choose all members from the selected sections
cluster sampling
select some starting point and then, select every kth element in the population
systematic sampling
helpus us understand data by drawing attention to the more important categories which have the highest frequency, organized from greatest to least
pareto chart
pareto chart has what on the axis
category on x, frequency on y
has category, frequency, and relative frequency
frequency distribution table
class width formula
(max value - min value) / # of classes
what do you use the class width for
add it to the first lower (lowest) limit class and so on when setting up the classes category and the ranges
frequency =
the number of a class in each category
relative frequency
the proportion/percent in each class
the sum of the frequencies for that class and all previous classes
cumulative frequency
a bar graph consisting of bars of equal width, bars don't have gaps in between
histogram
calc class boundary
midpoint of 2 adjacent classes, take upper limit of one boundary and lower of the second boundary and figure out the number in between
calc class midpoint
the average of the upper and lower class limit
what's on the axis of a histogram
x: class boundary/midpoint, y: frequency
histograms are useful for ___ datasets
large
graph has connected midpoints
frequency polygon
dot plots are useful for ___ datasets
small
represents quantitiatie data by separating each value into 2 parts of left and right digits
stem and leaf plot
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