Statistical Measures
Statistical Vocabulary
Graphs
Frequency Tables
Sampling
100
This measure of average involves the data that occurs most often.
What is mode?
100
This type of data cannot be measured using numbers; it must be measured (or described) in words.
What is qualitative data?
100
This graphical representation of data involves plotting points on a graph with Xs, and then joining them using a line of best fit.
What is a scatter plot?
100
This is the third column in a frequency table. It is a result of multiplying the first column (data points) with the second column (frequencies).
What is fx?
100
The entire group of people or species that we want to study.
What is population?
200
To calculate this average, you must first add up all the data points and then divide by the number of numbers.
What is mean?
200
A measure of the relationship between two types of data. It takes on a positive, negative, or zero value, and can be classified as weak or strong.
What is correlation?
200
This type of graph is most commonly used with qualitative data. The bars do not touch.
What is a bar chart?
200
This is a symbol that looks like a bit like an E and means "the sum of".
What is sigma?
200
A sampling method that is completely random; you could pick names or numbers out of a hat, for example.
What is random sampling?
300
Finding this average requires arranging the data in order and then finding the middle number.
What is median?
300
This is any quantitative data that can be counted and can only take certain values.
What is discrete data?
300
A diagram where the frequency is shown by the angles (in degrees) of each section of the circle.
What is a pie chart?
300
This is what we call the MODE in a grouped frequency distribution.
What is modal class?
300
This method of sampling involves choosing a sample that consists of the first people who come along or are available to you.
What is convenience sampling?
400
This is a measure of spread. It tells you how far apart your highest and lowest data points are.
What is range?
400
This word has to do with "four"s and involves dividing up the data into four equal parts. (Or, alternatively: finding the median, and then finding the median again.)
What is quartile?
400
This is a graph much like a bar graph. The difference is that it deals with continuous data and the bars always touch.
What is a frequency diagram?
400
A type of frequency table which deals with data that is organized in intervals.
What is a grouped frequency table?
400
This is a characteristic of a good survey question, which does not lead the respondent to give a particular answer.
What is unbiased?
500
This number represents how often (how many times) a certain data point occurs.
What is frequency?
500
The length of a room, the height of a person, and the temperature in any month are examples of this type of quantitative data.
What is continuous data?
500
Unlike a frequency diagram, the bars in this diagram represent frequency density. To find out the area of any given data point, you must first calculate the area of each bar.
What is a histogram?
500
To find this measure of average in a grouped frequency distribution, you must find the midpoint of each interval, then multiply each of the midpoints by the frequencies, then divide the sum of the frequency x midpoint by the sum of the frequencies.
What is mean?
500
A subset of the population that is used to represent the whole population.
What is a sample?
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