期中作業

Statistic <-c(68,85,74,88,63,78,90,80,58,63)
Math <-c(85,91,74,100,82,84,78,100,51,70)
plot(Statistic,Math,
     pch=20,
     col="red",
     xlab="統計",
     ylab="數學",
     main="統計成績與數學成績")

abc<-c(68,85,74,88,63,78,90,80,58,63)
hist(abc,
     col= "blue",
     main ="統計",
     xlab ="統計成績",
     ylab ="人數")

library("ggplot2")
data <- data.frame(
  社團名稱=c("娛樂休閒","知識閱讀","體育競技","科學創新","公益活動") ,  
  參加次數=c(185,82,36,28,25)
  )
ggplot(data, aes(x=社團名稱, y=參加次數)) + 
  geom_bar(stat = "identity", width=0.2,  fill="red")

labels<- c("娛樂休閒","知識閱讀","體育競技","科學創新","公益活動")  
 data<- c(185,82,36,28,25)
  pie(data,labels,main ="大學生最喜歡參加的社團", col=terrain.colors(length(data)))

lol<-c(84,63,61,49,89,51,59,53,79,91)

stem(lol)

## 
##   The decimal point is 1 digit(s) to the right of the |
## 
##   4 | 9
##   5 | 139
##   6 | 13
##   7 | 9
##   8 | 49
##   9 | 1

lol<- c( 84,63,61,49,89,51,59,53,79,91)


mean(lol)

## [1] 67.9

median(lol)

## [1] 62

as.numeric(names(table(lol)))[which.max(table(lol))] 

## [1] 49

sd(lol)

## [1] 16.25115

var(lol) 

## [1] 264.1

Q1 <- quantile(lol, 1 / 4)
Q3 <- quantile(lol, 3 / 4)

Q1

##  25% 
## 54.5

Q3

##   75% 
## 82.75