Test execution and control

Analysis and Evaluation RESOURCES I PRIMT I HELP

Review of Some Basic Statistics Concepts

Statistics is the collection and interpretation of quantitative data and the use of mathematics to estimate population parameters. In testing, the analyses of sample data, using statistical techniques, looks for what happened, how well the test article performed vs. some criteria, and makes predictions about future performance. The use of statistics for test design and analysis requires extensive training , beyond the scope of this course . However, testers should nevertheless understand some key concepts and terms, which have been simplified and summarized below and in the following screens.

Basic statistics Concepts and Terms:

Descriptiv e statistics : describes data in formats such as bar charts, graphs, histograms, curves, and frequency distributions. Examples are means, modes, median, range, and standard deviation.

Inferential statistics : draws conclusions from sample data to estimate performance of the entire population.

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TST102 Fundamentals of Test Evaluation

Lesson 19 – Analysis and Evaluation RESOURCES I PRIMT I HELP

Review of Some Basic St atistics Concepts

Sta tis tics is the collec tion and interpretation of quantitative data and the use of mathematics to estimate population parameters. In testing, the analyses of sample data, using statistical techniques, looks for what happened, how well the test article performed vs. some criteria, and makes predictions about future performance. The use of statistics for test design and analysis requires extensive training , beyond the scope of this course . However, testers should nevertheless understand some key concepts and terms, which have been simplified and summarized below and in the following screens.

Basic statistics ConcJ ———————–… Long Description

Descriptiv e statistics : tograms, curves, and frequency distributions. A large circle with the word population surrounds a deviation.

smaller circle with word sample.

Inferential statistics : ~m!”‘!!!l’l’l’l!’lml~i!”‘l~lll'”~'”!lll!”!lll~~l”!mmlft!-,m!l’l’lmfhce of the en tire population.

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TST102 Fundamentals of Test Evaluation