difference-of-sample-means test

См. также в других словарях:

• Sample size determination — is the act of choosing the number of observations to include in a statistical sample. The sample size is an important feature of any empirical study in which the goal is to make inferences about a population from a sample. In practice, the sample …   Wikipedia

• difference — The magnitude or degree by which one quality or quantity differs from another of the same kind. alveolar arterial oxygen d. the d. or gradient between the partial pressure of oxygen in the alveolar spaces and the arterial blood : P( …   Medical dictionary

• test — 1. To prove; to try a substance; to determine the chemical nature of a substance by means of reagents. 2. A method of examination, as to determine the presence or absence of a definite disease or of some substance in any of the fluids, tissues,… …   Medical dictionary

• Sample size — The sample size of a statistical sample is the number of observations that constitute it. It is typically denoted n , a positive integer (natural number).Typically, all else being equal, a larger sample size leads to increased precision in… …   Wikipedia

• Student's t-test — A t test is any statistical hypothesis test in which the test statistic follows a Student s t distribution if the null hypothesis is supported. It is most commonly applied when the test statistic would follow a normal distribution if the value of …   Wikipedia

• Tukey's test — Tukey s test, named after John Tukey, is a statistical test generally used in conjunction with an ANOVA to find which means are significantly different from one another. It compares all possible pairs of means, and is based on a studentized range …   Wikipedia

• Z-test — The Z test is a statistical test used in inference which determines if the difference between a sample mean and the population mean is large enough to be statistically significant, that is, if it is unlikely to have occurred by chance.The Z test… …   Wikipedia

• Pearson's chi-squared test — (χ2) is the best known of several chi squared tests – statistical procedures whose results are evaluated by reference to the chi squared distribution. Its properties were first investigated by Karl Pearson in 1900.[1] In contexts where it is… …   Wikipedia

• Student's t-test — /tee test /, Statistics. a test for determining whether or not an observed sample mean differs significantly from a hypothetical normal population mean. [1945 50; see STUDENT S T DISTRIBUTION] * * * ▪ statistics       in statistics, a method of… …   Universalium

• Welch's t test — In statistics, Welch s t test is an adaptation of Student s t test intended for use with two samples having possibly unequal variances. As such, it is an approximate solution to the Behrens–Fisher problem.FormulasWelch s t test defines the… …   Wikipedia

• Comparing means — The following tables provide guidance to the selection of the proper parametric or non parametric statistical tests for a given data set. Contents 1 Is there a difference ? 2 See also 3 Sources 4 …   Wikipedia