Method: T-test

Methods: Paired T-Test, T-test,
Topics: Famous Datasets, Miscellaneous,
Datafile Name: Difference Tests
Abstract:

Four sets of data are presented. The first is measures of tire wear by two methods, the so-called weight method and the groove method. The second is Gosset's famous example of corn yield from split plots of regular and kiln dried seed. The third set is waiting times between eruptions of Old F...

Methods: Summary Statistics, T-test,
Topics: Environment,
Datafile Name: Refinery
Abstract:

An oil refinery northeast of San Francisco conducted a series of 31 daily measurements of the carbon monoxide levels arising from one of their stacks between April 16 and May 16, 1993. The measurements were submitted as evidence for establishing a baseline to the Bay Area Air Quality Management D...

Methods: T-test, Outlier, Boxplot, Mann Whitney U Test, Summary Statistics,
Topics: Health, Medical,
Datafile Name: Nursing Home Data
Abstract:

Acorn is the acronym for Association of Community Organizations for Reform Now.
These data were presented by Acorn to a Joint Congressional Hearing on discri-
mination in lending.  Acorn concluded that "banks generally have exhibited a per-
vasive pattern of lending...

Methods: Assumptions, Regression, Outlier, T-test, Boxplot, Diagnostics, Multivariate Regression,
Topics: Economics,
Datafile Name: OECD Economic Development
Abstract:

Data on per capita income and the percentages of the labor force employed in agriculture, industry, and service occupations for 20 Eurpoean OECD countries lend themselves to several kinds of analysis. Univariate analysis of each of the variables is interesting, and the relations between per capit...

Methods: Outlier, Boxplot, T-test, Summary Statistics,
Topics: Consumer, Economics, Finance,
Datafile Name: Refusals in Mortgage Lending
Abstract:

Acorn is the acronym for Association of Community Organizations for Reform Now. These data were presented by Acorn to a Joint Congressional Hearing on discri- mination in lending. Acorn concluded that "banks generally have exhibited a per- vasive pattern of lending practices that have the ef...

Methods: Experimental Design, T-test,
Topics: Education, Psychology,
Datafile Name: Scents
Abstract:

Can pleasant aromas help a student learn better? Hirsch and Johnston, of the Smell & Taste Treatment and Research Foundation, believe that the presence of a floral scent can improve a person's learning ability in certain situations. In their experiment, 22 people worked through a set of t...

Methods: Boxplot, T-test, ANOVA,
Topics: Physics,
Datafile Name: Michelson
Abstract:

In 1879, A. A. Michelson made 100 determinations of the velocity of light in air using a modification of a method proposed by the French physicist Foucault. These measurements were grouped into five trials of 20 measurements each. The numbers are in km/sec, and have had 299,000 subtracted from th...

Methods: Paired T-Test, T-test,
Topics: Biology,
Datafile Name: Student t-distribution
Abstract:

Charles Darwin (1809-1882), author of The Origin of Species (1859) later investi-
gated the effect of cross-fertilization on the size of plants. Pairs of plants, one cross- 
and one self-fertilized at the same time and whose parents were grown from the same
seed, were pl...

Methods: Regression, T-test, Time Series,
Topics: Government, Medical, Miscellaneous, Sports,
Datafile Name: Time Series
Abstract:

The datafile includes four series which can be described as time series exper- iments. At some point in the time series, new conditions are introduced. The question then is raised whether the sample of observations after the change comes from a population with a different mean than the sample of ...

Methods: Assumptions, Regression, Outlier, T-test, Boxplot, Diagnostics, Multivariate Regression,
Topics: Economics,
Datafile Name: OECD Economic Development
Abstract:

The Datafile OECD Economic Develpment  contains per capita income (PCINC)
and the percentage of the labor force employed in agriculture (AGR) for 20 European
OECD countries in 1960. Below are the same variables for the United States by 
decades with PCINC adjusted t...

Methods: Outlier, T-test, Mann Whitney U Test, ANOVA,
Topics: Economics,
Datafile Name: Waste Run-up
Abstract:

The Mann-Whitney test is available when the normal assumption underlying the Student t-test is in question. are outliers in the data. The data on weekly run-up (or waste percent) for five suppliers of the Levi-Strauss clothing plant in Albuquerque provides an example. Presence of outliers violate...

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