Question

R Programming Exercise 21
Easy Difficulty

"airquality.csv" consists of temperature readings from month of May to September. The Temperature column is 4th and Month column is 5th. Write a code which will take 5 random temperatures from each month. Then calculate its mean and standard deviation. Assume that you don't know how many temperature readings there are in each month.

Answer 1

See The following attached code.

#The file airquality already exists in R hence we can easily access it. View(airquality) #View the data attach(airquality) #Column Names are stored as variables. set.seed(100) #Now we collect five random temparatures M5=sample(subset(airquality,Month=="5")$Temp,size=5) M6=sample(subset(airquality,Month=="6")$Temp,size=5) M7=sample(subset(airquality,Month=="7")$Temp,size=5) M8=sample(subset(airquality,Month=="8")$Temp,size=5) M9=sample(subset(airquality,Month=="9")$Temp,size=5) #Now the collect all the sample points to form a single vector. Data=c(M5,M6,M7,M8,M9) #Finally we calculate the mean and Standard Deviation using the following command. mean(Data) sd(Data)