Week 12 Lab

TASK 1

```{r}if (!require(“tidyverse”))} install.packages(“tidyverse”) library(tidyverse)

mydata <- read.csv(“https://raw.githubusercontent.com/drkblake/Data/main/DormTemps.csv”) head(mydata, 10)

mydata\(V1 <- mydata\)RoomTemp test_value = 70.0

ggplot(mydata, aes(x = V1)) + geom_histogram(color = “black”, fill = “#1f78b4”) + geom_vline(aes(xintercept = mean(V1)))

mydata %>% select(V1) %>% summarise( count = n(), mean = mean(V1, na.rm = TRUE), sd = sd(V1, na.rm = TRUE), min = min(V1, na.rm = TRUE), max = max(V1, na.rm = TRUE), W Statistic = shapiro.test(V1)\(statistic, `p-value` = shapiro.test(V1)\)p.value)

t.test(mydata$V1, mu = test_value)

# Conclusion: 

The average is at 62.7 degrees and that is lower than the schools stated average of 70. This is a huge significant change.

# Task 2:


```r
if (!require("tidyverse"))
  install.packages("tidyverse")

## Loading required package: tidyverse

## ── Attaching core tidyverse packages ──────────────────────── tidyverse 2.0.0 ──
## ✔ dplyr     1.1.4     ✔ readr     2.1.5
## ✔ forcats   1.0.0     ✔ stringr   1.5.1
## ✔ ggplot2   3.4.4     ✔ tibble    3.2.1
## ✔ lubridate 1.9.3     ✔ tidyr     1.3.1
## ✔ purrr     1.0.2     
## ── Conflicts ────────────────────────────────────────── tidyverse_conflicts() ──
## ✖ dplyr::filter() masks stats::filter()
## ✖ dplyr::lag()    masks stats::lag()
## ℹ Use the conflicted package (<http://conflicted.r-lib.org/>) to force all conflicts to become errors

if (!require("gmodels"))
  install.packages("gmodels")

## Loading required package: gmodels

library(gmodels)
library(tidyverse)

mydata <- read.csv("https://raw.githubusercontent.com/drkblake/Data/main/DormTemps.csv")
head(mydata, 10)

##    DormID RoomTemp        Range
## 1       1     61.0 Out of range
## 2       2     72.9     In range
## 3       3     67.0     In range
## 4       4     64.2 Out of range
## 5       5     62.2 Out of range
## 6       6     70.4     In range
## 7       7     62.7 Out of range
## 8       8     62.3 Out of range
## 9       9     62.2 Out of range
## 10     10     64.2 Out of range

mydata$V1 <- mydata$Range

ggplot(mydata, aes(x = V1)) +
  geom_bar(fill = "royalblue")

CrossTable(
  mydata$V1,
  prop.chisq = FALSE,
  prop.t = FALSE,
  prop.r = FALSE)

## 
##  
##    Cell Contents
## |-------------------------|
## |                       N |
## |-------------------------|
## 
##  
## Total Observations in Table:  175 
## 
##  
##              |     In range | Out of range | 
##              |--------------|--------------|
##              |           26 |          149 | 
##              |        0.149 |        0.851 | 
##              |--------------|--------------|
## 
## 
## 
## 

test <- chisq.test(table(mydata$V1))
test

## 
##  Chi-squared test for given probabilities
## 
## data:  table(mydata$V1)
## X-squared = 86.451, df = 1, p-value < 2.2e-16

Conclusion 2:

The data shows that only 14% are in range and then 85% are out of range. This shows the university’s claim is incorrect