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In statistics, Welch's t-test, or unequal variances t-test, is a two-sample location test which is used to test the (null) hypothesis that two populations have equal means. It is named for its creator, Bernard Lewis Welch , and is an adaptation of Student's t -test , [ 1 ] and is more reliable when the two samples have unequal variances and ...
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Print/export Download as PDF ... Location test: Homoscedasticity [9] Welch's t-test: interval: normal: unpaired: 2: ... This page was last edited on 5 July 2024, at ...
Welch was appointed to the Chair in Statistics in 1968. Following the establishment of the School of Mathematics, he was appointed Head of the newly created Department of Statistics where he remained until his retirement Welch retired in 1976. In June 1989, he suffered a stroke; on 29 December 1989 Welch died as a result of it.
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Display a year or month calendar Template parameters [Edit template data] Parameter Description Type Status Year year the ordinal year number of the calendar Default current Number suggested Month month whether to display a single month instead of a whole year, and which one Default empty Example current, next, last, 1, January String suggested Show year show_year whether to display the year ...
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If there is interest in the marginal probability of obtaining a tail, only the number T out of the 100 flips that produced a tail needs to be recorded. But T can also be used as a test statistic in one of two ways: the exact sampling distribution of T under the null hypothesis is the binomial distribution with parameters 0.5 and 100.