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Terms in this set (15)
box plot
a plot showing the minimum, maximum, first quartile, median, and third quartile of a data set; the middle 50% of the data is indicated by a box.
dot plot
a frequency plot that shows the number of times a response occurred in a data set, where each data value is represented by a dot.
first quartile
the value that identifies the lower 25% of the data; the median of the lower half of the data set; written as Q 1
histogram
a frequency plot that shows the number of times a response or range of responses occurred in a data set.
interquartile range
the difference between the third and first quartiles; 50% of the data is contained within this range
mean
the average value of a data set, found by summing all values and dividing by the number of data points
mean absolute deviation
the average absolute value of the difference between each data point and the mean; found by summing the absolute value of the difference between each data point and the mean, then dividing this sum by the total number of data points
measures of center
values that describe expected and repeated data values in a data set; the mean and median are two measures of center.
measures of spread
a measure that describes the variance of data values, and identifies the diversity of values in a data set.
median
the middle-most value of a data set; 50% of the data is less than this value, and 50% is greater than it
outlier
a data value that is much greater than or much less than the rest of the data in a data set; mathematically, any data less than Q 1 - 1.5(IQR) or greater than Q 3 + 1.5(IQR) is an outlier
skewed to the left
data concentrated on the higher values in the data set, which has a tail to the left.
skewed to the right
data concentrated on the lower values in the data set, which has a tail to the right.
third quartile
value that identifies the upper 25% of the data; the median of the upper half of the data set; 75% of all data is less than this value; written as Q 3
symmetric
situation in which data is concentrated toward the middle of the range of data; data values are distributed in the same way above and below the middle of the sample.
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