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Task 4A

setwd("F:/!!!rd trimester/Data Analytics/day 5")
data.df<- read.csv(paste("Titanic Data.csv", sep = ""))
View(data.df)

Task 4b

aggregate(data.df$Age, by=list(sex=data.df$Sex, Survived=data.df$Survived==1), mean)
##      sex Survived        x
## 1 female    FALSE 26.02346
## 2   male    FALSE 31.17543
## 3 female     TRUE 28.79784
## 4   male     TRUE 27.63119

Task 4c

 t.test(data.df$Survived, data.df$Age, paired=TRUE)
## 
##  Paired t-test
## 
## data:  data.df$Survived and data.df$Age
## t = -67.065, df = 888, p-value < 2.2e-16
## alternative hypothesis: true difference in means is not equal to 0
## 95 percent confidence interval:
##  -30.12782 -28.41458
## sample estimates:
## mean of the differences 
##                -29.2712

Based on the output of Dependent T-Test, we can accept the Hypothesis, H2:The Titanic survivors were younger than the passengers who died.