36 terms

MrsTaylorMCMSTEACHER

Statistics

Numerical facts or data that can be put together or tabulated to present information about a given subject.

Statistical Question

A question that anticipates there will be different answers in the data.

Numerical Data

data that can be counted or measured (Also called quantitative data)

Observation

What is seen or measured

Data Set

A group of related numbers used to analyze statistical information.

Frequency

How often something happens in a given time. The number of times an event, action, value, or characteristic occurs.

Frequency Table

A display organizing categorical or numerical data and how often each occurs.

Histogram

A special kind of bar graph that shows how frequently data occurs. The data are usually collected in a frequency table and then put into graph form. In a histogram, the adjacent bars are touching.

Dot Plot

A method of visually displaying a distribution of data values where each data value is shown as a dot or mark above a number line. Also known as a dot plot.

Box and Whiskers Plot

A diagram that summarizes data using median, the upper quartile and lower quartiles, and the extreme values. A box is drawn around the quartile values and whiskers extend from each quartile to the extreme data points.

Median

The number that would fall in the middle if the results were arranged in order from least to greatest (smallest to largest).

Quartile

Division of data into 4 equal parts

Upper Quartile

The median of the upper half of a set of data.

Lower Quartile

The median of the lower half of a set of data.

Interquartile Range

The difference between the upper and lower quartiles.

Range

The difference between the smallest number and the largest number in the sample.

Mean

The average value of a set of numbers.

Mode

The number that occurs most frequently in a set of information. When collecting data or information, it's the number of which there is the most.

Distribution

The frequency or occurrence of something

Center

The middle of the data (median, Q2)

Spread

distribution of the data

Measure of Central Tendency

Plotting data in a frequency distribution shows the general shape of the distribution and gives a general sense of how the numbers are bunched. Several statistics can be used to represent the "center" of the distribution.

Deviation

measure of how spread out numbers are

Skew

When the data is more towards one number/side

Outlier

Data value that is far from the other values in that particular set

Variance

The average of the squared differences from the Mean.

Measure of Variablity

Measures to describe the amount of variability or spread in a set of data. The most common measures of variability are the range, the interquartile range (IQR), variance, and standard deviation.

Cluster

When data seems to be "gathered" around a particular value.

Mean Absolute Deviation

the average distance of each data value from the mean. The MAD is a gauge of "on average" how different the data values are form the mean value.

Likert Scale

indication of the extent to which a respondent agrees or disagrees with a statement

Average

A number that represents the middle or most normal of a set of numbers. Also called the mean or arithmetic mean.

Data

Facts or Figures from which conclusions can be formed; Factual information

Line Plot

A line plot is a method for organizing data along a number line; it is used to show frequency. Often an "x" or other mark is used to represent each bit of data.

Survey

A way to gather data or opinions from a sample.

Tally Mark

A set of five lines used to keep track of the number of something when counting.

Interval

the difference between two numbers on the scale