## examples of confidence intervals and tests in R
## ADM 10/23/2007

## for anything involving the mean, we have to work with the raw data
my.data <- c(1,2,3,4,5,6,5,4,3,2,1)

## here are confidence intervals for the population mean, first for 95%
## and then 99%
t.test(my.data)
t.test(my.data, conf.level=.99)

## to perform a hypothesis test, we again pass the data and also provide
## the population mean under the null hypothesis
t.test(my.data, mu = 1)

## here is a confidence interval for a population proportion, we are
## passing the number of "successes" (or the number of 1s) first, and
## then the number of trials
prop.test(543,1000)

## to conduct a hypothesis test, all we have to do additional is provide
## the population proportion under the null hypothesis.  This is the 
## roulette example from class
prop.test(1890, 3800, p = 18/38)