Two Sample T-Test

STATISTICAL COMPUTING LAB

SCL:
3381 Rood Hall
phone: (269) 387-2852
slab@stat.wmich.edu

Directors:
Dr. Joseph W. McKean
5506 Everett Tower
Department of Statistics
phone: (269) 387-4541
joe@stat.wmich.edu

Dr. John Kapenga
Department of Computer Science
phone: (269) 387-5657
john@cs.wmich.edu

Coodinator:
John Kloke
6610 Everett Tower
Department of Statistics
john.kloke@wmich.edu

ADDITIONAL RESOURCES

TWO SAMPLE STUDENT T-TEST

Contributers: Laila Poisson and Gail Smythe

Welcome! Please follow the instructions provided below..

Enter your data in the space provided here for data input. First line in each window must be a label; for example, X in the one window and Y in the other window.
Press enter between each data value so that there is only one value per line.

Note: It is not necessary that your data sets have equal sample sizes.

The null hypothesis is "the difference of means is equal to zero." Choose the alternative hypothesis you wish to use.

Indicate the confidence level you wish to use for testing and for the confidence interval. Enter this value as a decimal value.

This program assumes that the variances of the two data sets are equal. It will therefore use a pooled variance estimate. You may wish to veiw comparative plots of your data so that you can visually check that the variances are equal. Choose all of the comparative plots that you wish to have displayed.

Comparative Dotplots
Comparative Boxplots
Q-Q Plot (with the x = y line included)

It is required that you enter both an "x" data set and a "y" data set. Also, you must choose an alternative hypothesis and a confidence level. Please check that you have done these things before submitting.

Send questions or comments to a slab@stat.wmich.edu

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