#Biostatistics 120

#t.test IN R
#TO FIND INFORMATION ON t.test()
?t.test

#ZAR EXAMPLE 7.2
ZAR=read.table("ZarEX7.2.txt")
ZAR
attach(ZAR)
X=RATwtchg
t.test(X,alternative="two.sided", mu=0,conf.level=0.95)

#ZAR EXAMPLE 7.1
ZAR=read.table("ZarEX7.1.txt")
ZAR
attach(ZAR)
X=crabtemp
t.test(X,alternative="two.sided", mu=24.3,conf.level=0.95)

#ZAR EXAMPLE 7.3
ZAR=read.table("ZarEX7.3.txt")
ZAR
attach(ZAR)
X=wtchg
t.test(X,alternative="less", mu=0,conf.level=0.95)
#NOTE: R REPORTS A ONE-WAY CI

#ZAR EXAMPLE 7.4
ZAR=read.table("ZarEX7.4.txt")
ZAR
attach(ZAR)
X=distime
t.test(X,alternative="greater", mu=45,conf.level=0.95)
#NOTE: R REPORTS A ONE-WAY CI