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stem-and-leaf plot

Overview page. Subjects: Mathematics — Psychology.

A method of displaying grouped data, by listing the observations in each group, resulting in something like a histogram on its side. For the observations 45, 25, 67, 49, 12, 9, 45, 34, 37,...

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Tower of Hanoi

Overview page. Subjects: Mathematics — Psychology.

A logical puzzle, frequently studied in cognitive psychology and used as a test of problem-solving ability, consisting of three pegs, on one of which are placed a number of discs of varying...

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travelling salesman problem

Overview page. Subjects: Mathematics — Psychology.

A network problem that can be formulated as a combinatorial optimization problem. A salesman has to visit a number of interconnected destinations. The problem is to determine the route that...

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trimmed mean

Overview page. Subjects: Probability and Statistics — Psychology.

In statistics, the arithmetic mean calculated after eliminating a specified proportion or percentage of the largest and smallest scores, a common type being the 5 per cent trim. It is used...

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Ward's method

Overview page. Subjects: Psychology — Probability and Statistics.

An agglomerative clustering method proposed by Ward in 1963. The clustering criterion is based on the error sum of squares, E, which is defined as the sum of the squared distances of...

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z test

Overview page. Subjects: Psychology — Probability and Statistics.

A test, using a sample of n independent observations, of the null hypothesis that a normal distribution with variance σ 2, has mean μ. Writing the sample mean as , the test...

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