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=8,
     col="pink",
     xlab="統計成績",
     ylab="數學成績",
     main="班級的統計成績和數學成績")

we <- c(68,85,74,88,63,78,90,80,58,63)

hist(we,
     col="purple",
     main ="班上的統計",
     xlab ="統計",
     ylab ="人數")

library("ggplot2")
data <- data.frame(
  社團=c("娛樂休閒","知識閱讀","體育競技","科學創新","公益活動") ,  
  次數=c(185,82,36,28,25)
  )
ggplot(data, aes(x=社團, y=次數)) +
  geom_bar(stat = "identity", width=0.5,  fill="lightyellow")

data<- c(185,82,36,28,25)
labels <- c("娛樂休閒","知識閱讀","體育競技","科學創新","公益活動")
pie(data,labels,main ="大學生喜愛社團比例", col=heat.colors(length(data)))

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

stem(Japanese)

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

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

mean(Japanese)

## [1] 67.9

median(Japanese)

## [1] 62

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

## [1] 49

sd(Japanese)

## [1] 16.25115

var(Japanese)

## [1] 264.1

Q1 <- quantile(Japanese,1/4)
print(Q1)

##  25% 
## 54.5

Q3 <- quantile(Japanese,3/4)
print(Q3)

##   75% 
## 82.75