One Sample T Confidence Intervals
The R function t.test
(on-line
help) does t tests and confidence intervals.
does the example on the slides for class.
This example can also be done reading the data from a URL
Two Sample T Confidence Intervals
The R functiont.test
also does two-sample tests.
Assuming Equality of Variances
does the example on the slides for class.
Welch's Approximation
does the example on the slides for class.