titanic.df <- read.csv(paste("Titanic Data.csv", sep=""))
View(titanic.df)
aggregate(titanic.df$Age, by=list(Survived=titanic.df$Survived), mean)
## Survived x
## 1 0 30.41530
## 2 1 28.42382
We can see from the above table that the average age
of people who survived is 28.42382 and the average age
of those who died is 30.41530
attach(titanic.df)
t.test(Age~Survived, data=titanic.df)
##
## Welch Two Sample t-test
##
## data: Age by Survived
## t = 2.1816, df = 667.56, p-value = 0.02949
## alternative hypothesis: true difference in means is not equal to 0
## 95 percent confidence interval:
## 0.1990628 3.7838912
## sample estimates:
## mean in group 0 mean in group 1
## 30.41530 28.42382
The p value is 0.02949
We see that since the p value is not <0.001 we cannot reject the null hypothesis and the titanic survivors were younger than the passengers who died.