Week 9 Flashcards
(19 cards)
the way a variable’s values are spread over all possible values, represented by frequency tables and graphs
distribution
balance point for a data distribution - the “average”
mean
middle value of a data set when arranged in ascending or descending order
median
most common value in a data set - may have one, more than one, or none
mode
value in a data set that is dramatically higher or lower than all other values - affects mean but not median or mode
outlier
having only one mode in a distribution (single-peaked)
unimodal
having two modes in a distribution (multiple peaks)
bimodal
distribution that has no mode (or more than two modes, so really no mode)
uniform distribution
left and right halves of a distribution are mirror images of each other - mean, median, and mode are the same if distribution is single-peaked
symmetric
asymmetrical distribution where values tend to be more spread out on one side than the other
skewed
asymmetrical distribution with outliers at low values (negatively skewed)
left-skewed
asymmetrical distribution with outliers at high values (positively skewed)
right-skewed
describes how widely data values are spread out from the center of a data set
variation
the difference between the highest and lowest values in a data set - used to compute variation simply
range
values that divide the data distribution into quarters
quartiles
five values that describe a data set - lowest value, lower quartile, median, upper quartile, and highest value
five-number summary
graph used to display five-number summary of data
boxplot (box-and-whisker plot)
measure of how far data values are spread around the mean of a data set
standard deviation
how far one value is from the mean in a data set (data value - mean = ___)
deviation
