a measure that represents the center, or typical value, of a data set. The mean, median, and mode are measures of center.
What is a measure of center.
100
the difference of the greatest value and the least value.
What is the range.
100
shows the variability of a data set along a number line
using the least value, the greatest value, and the quartiles of the data.
What is a box-and-whiskers plot.
100
The shape of a data distribution when the “tail” of the graph extends to the left. Most of the data are on the right.
What is skewed left.
100
this type of frequency table that displays data collected from one source that belong to two different categories. One category of data is represented by rows, and the other is represented by columns.
What is a two-way table.
200
the sum of the data divided by the number of data values. It is read as “x-bar.”
What is the mean.
200
another name for the mean.
What is the average.
200
divide the data set into four equal parts.
What are quartiles.
200
Describes the shape of the data distribution when the data on the right of the distribution are approximately a mirror image of the data on the left of the distribution.
What is symmetric.
200
The sums of the rows and columns in a two-way table are called these.
What are marginal frequencies.
300
the middle number when the values are written in numerical order. When a data set has an even number of values, the
it is the mean of the two middle values.
What is the median.
300
a procedure that uses a mathematical operation to change a
data set into a different data set.
What is a data transformation.
300
the name for the minimum, first quartile, median (Q2), third quartile, and maximum.
What is the 5-number summary.
300
Describes the shape of a data distribution when the “tail” of the graph extends to the right. Most of the data are on the left.
What is skewed right.
300
This is the ratio of a joint relative frequency to the marginal relative frequency.
What is a conditional relative frequency.
400
the value or values that occur most often. There may
be one, none, or more than one.
What is the mode.
400
a measure that describes the spread, or distribution, of
a data set. One type of this is the range.
What is measure of variation.
400
Another measure of variation for a data set is this, which
is the difference of the third quartile, Q3, and the first quartile, Q1. It represents the range of the middle half of the data.
What is the interquartile range (IQR)
400
When the data distribution is this shape you use the mean to describe the center and use the standard deviation to describe the variation.
What is symmetric.
400
This type of data consist of labels or nonnumerical entries that can be separated into different categories. When using qualitative data, operations such as adding or finding a mean do not make sense.
What is qualitative or categorical data.
500
a data value that is much greater than or much less than the other values in a data set.
What is an outlier.
500
a measure of how much a typical value in the data set differs from the mean. The symbol σ represents it.
What is standard deviation.
500
About this percent of the data lie within 1 standard deviation of the mean.
About this percent of the data lie within 2 standard deviations of the mean.
What is 68% and 95%.
500
When the data distribution is this shape you use the median to describe the center and use the five-number summary to describe the variation
What is skewed right or left.
500
This type of data consist of numbers that represent counts or measurements.