R:T-Test

Load Packages

haven

if(!require(haven)){
  install.packages("haven", dependencies = TRUE)
  library(haven)
}

Loading required package: haven

tidyverse

if(!require(tidyverse)){
  install.packages("tidyverse", dependencies = TRUE)
  library(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   3.5.1     ✔ 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

Import Data

dataset.spss <- read_sav ("Harry Potter Data.sav")   

T-Test

Smallest P Value

t.test(formula = dataset.spss$FFM_1 ~ CoinFlip,
       data = dataset.spss,
       var.equal = FALSE)  

    Welch Two Sample t-test

data:  dataset.spss$FFM_1 by CoinFlip
t = -2.419, df = 76.753, p-value = 0.01793
alternative hypothesis: true difference in means between group 1 and group 2 is not equal to 0
95 percent confidence interval:
 -1.0412385 -0.1009527
sample estimates:
mean in group 1 mean in group 2 
       3.307692        3.878788 

Largest P Value

t.test(formula = dataset.spss$FFM_35 ~ CoinFlip,
       data = dataset.spss,
       var.equal = FALSE)

    Welch Two Sample t-test

data:  dataset.spss$FFM_35 by CoinFlip
t = -0.020485, df = 61.087, p-value = 0.9837
alternative hypothesis: true difference in means between group 1 and group 2 is not equal to 0
95 percent confidence interval:
 -0.5383282  0.5274101
sample estimates:
mean in group 1 mean in group 2 
       3.446154        3.451613