Assignment5A2

##https://rpubs.com/anup0stha/1397892

library(readxl)
library(ggpubr)

## Loading required package: ggplot2

DatasetA2 <- read_excel('/Volumes/Anup/SLU/3rd Sem/Applied Analytics/Asignment5/DatasetA2.xlsx')

Calculating Frequency Tabble

table(DatasetA2$FavoriteDrink)

## 
## Coffee   Soda    Tea  Water 
##     26     29     28     17

Creating Bar Chart

ggplot(DatasetA2, aes(x = FavoriteDrink, fill = FavoriteDrink)) +
  geom_bar() +
  labs(
    x = "Favorite Drink",
    y = "Frequency",
    title = "Distribution of Favorite Drink"
  ) +
  theme(
    text = element_text(size = 14),       
    axis.title = element_text(size = 14), 
    axis.text = element_text(size = 14), 
    plot.title = element_text(size = 14), 
    legend.position = "none"             
  )

Conducting the Chi-Square Goodness-of-Fit Test

observed <- c(26,29, 28,17) 
expected <- c(0.25, 0.25, 0.25,0.25)
chisq.test(x = observed, p = expected)

## 
##  Chi-squared test for given probabilities
## 
## data:  observed
## X-squared = 3.6, df = 3, p-value = 0.308

A chi-square goodness-of-fit test indicated that the observed frequencies were not different from the expected frequencies, χ²(df) = 3.6, p = 0.308.