Uji Hipotesis Preferensi Musik

if (!require(readxl)) {
  install.packages("readxl")
}
## Loading required package: readxl
## Warning: package 'readxl' was built under R version 4.3.3
library(readxl)

Meload dataset

data <- read_excel("D:/[UNNES]/SEMESTER 3 [24 SKS]/Komputasi Statistika [3 SKS]/P6/preferensi_musik.xlsx")

Menampilkan Isi dataset

head(data)
## # A tibble: 6 × 3
##   user_id genre daily_listening_minutes
##     <dbl> <chr>                   <dbl>
## 1       1 Pop                       120
## 2       2 Rock                       95
## 3       3 Jazz                       80
## 4       4 Pop                       130
## 5       5 Rock                      100
## 6       6 Jazz                       90

Uji Hipotesis One Sample t-test: Apakah durasi rata-rata mendengarkan musik lebih dari 100 menit?

one_sample_test <- t.test(data$daily_listening_minutes, mu = 100)

one_sample_test
## 
##  One Sample t-test
## 
## data:  data$daily_listening_minutes
## t = 1.2359, df = 24, p-value = 0.2284
## alternative hypothesis: true mean is not equal to 100
## 95 percent confidence interval:
##   91.42528 134.17472
## sample estimates:
## mean of x 
##     112.8

Uji Hipotesis Two Sample t-test: Apakah durasi rata-rata mendengarkan musik berbeda antara penggemar Pop dan Jazz?

pop_jazz_test <- t.test(daily_listening_minutes ~ genre, data = subset(data, genre %in% c("Pop", "Jazz")))

pop_jazz_test
## 
##  Welch Two Sample t-test
## 
## data:  daily_listening_minutes by genre
## t = -1.6361, df = 8.665, p-value = 0.1376
## alternative hypothesis: true difference in means between group Jazz and group Pop is not equal to 0
## 95 percent confidence interval:
##  -54.458532   8.902977
## sample estimates:
## mean in group Jazz  mean in group Pop 
##            85.0000           107.7778

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