Question

2. The ToothGrowth dataset in R gives information about the effect of Vitamin C on tooth grown in Guinea Pigs. (Use the command ? ToothGrowth for more information on the data and each individual variable.) Load this data into R using the command data("ToothGrowth"). a. Create boxplots of the guinea pigs' tooth length by the factor levels for supplement type and dosage. Be sure to include an appropriate title and axis labels to match your boxplots. Writedown your R code below. (4pts) Hint: you can create factor levels in a formula by using factorA * factorB. b. Based on your boxplots, do you think there are differences among the six treatments? (2pts)

this all the information given...plug in data(toothgrowth) into rstudio.cloud

Answer 1

from boxplot we can conclude that there is significant difference in the all the six treatments.

Project: (None) Console Terminal I > library (dplyr) > library(ggplot2) > data("Toothgrowth") > data<-ToothGrowth > head(data) len supp dose 1 4.2 VC 0.5 2 11.5 VC 0.5 3 7.3 VC 0.5 4 5.8 VC 0.5 5 6.4 VC 0.5 6 10.0 VC 0.5 > data$dose=as.factor(data$dose) > ggplot(data, aes (y=len,x=dose, color=supp))+geom_boxplot()+ggtitle("B oxplot for guinea pig's tooth length") Files Plots Packages Help Viewer Zoom Export Publish Boxplot for guinea pig's tooth length 30 - supp 520- VC 10 - dose