Practice

## Copy and paste the code chunk below into the top of your R Markdown document
library(ggplot2)
library(dplyr)

theme_set(theme_bw())

## Cattle data
cattle <- read.csv("https://collinn.github.io/data/cattle.csv")

Introduction

Question 1: Which breed of cattle has the longest average horn length? Find the necessary statistics and create the appropriate plot to illustrate.

Question 2: Create a new categorical variable milk that takes the value "large" if milk production for a cow is above the median and "small" if it is below. Create the appropriate graph to illustrate the relationship between feed type and milk production

Question 3: We are now interested in learning if hormone treatment is associated with reduced milk production. Using the category created in Q2, perform a difference of proportions test