Statistics VOCABULARY

Front

Statistics is the use of numbers to describe and make informed decisions about sets of numbers or objects in a population.

Back

Statistics helps in making inferences about a population and comparing differences in populations.

Front

Measures of central tendency describe a set of data by identifying the central position within the set.

Back

Mean, median, and mode are valid measures of central tendency.

Front

The mean is the average of a set of numbers.

Back

To calculate the mean, add all the numbers in the sample set together and divide by the number of data values.

Front

Example: A student earned test scores of 73%, 88%, 79%, 81%, 93%, and 96%. What is the mean?

Back

The mean test score is 85%.

Front

The median is the middle number of a set of numbers written in numerical order.

Back

If there is an even number of values, the median is the average of the two middle numbers.

Front

Definition of Mode

Back

The mode is the number that appears most often in a set of numbers. A set of numbers can have no mode, one mode, or more than one mode.

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Example of Mode

Back

If twelve people pick their favorite number from 1 to 10, and the numbers are 2, 2, 3, 5, 6, 7, 7, 7, 8, 9, and 9, the mode is 7 because it appears most often.

Front

Definition of Range

Back

The range of a set of numbers is the difference between the largest and smallest number in the entire set.

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Example of Range

Back

If a clothing store sold shirts in quantities of 16, 22, 14, 32, 28, 46, and 52 over seven days, the range is 38 because 52 - 14 = 38.

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Organizing and Displaying Data

Back

Data can be represented in various ways such as tables, charts, and graphs. Organizing data helps to see patterns and draw conclusions about populations.