library(tidyverse)
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library(lsr)
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library(car)
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## Zorunlu paket yükleniyor: carData
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set.seed(1923)
deney_grubu <- rnorm(50, mean = 45, sd=8) #deneygrubu
kontrol_grubu<-rnorm(50,mean = 52, sd=8) #konrtrolgrubu
fare_verisi<-data.frame(grup=rep(c("deney","kontrol"),each=50))%>%
  mutate(sure=round(c(deney_grubu,kontrol_grubu),2))
head(fare_verisi)
##    grup  sure
## 1 deney 39.81
## 2 deney 45.56
## 3 deney 53.49
## 4 deney 56.08
## 5 deney 52.47
## 6 deney 42.59
tail(fare_verisi)
##        grup  sure
## 95  kontrol 46.23
## 96  kontrol 59.74
## 97  kontrol 52.52
## 98  kontrol 50.93
## 99  kontrol 62.96
## 100 kontrol 64.11
fare_istatistik<- fare_verisi %>%
  group_by(grup) %>%
  summarise(N=n(),
   ortalama=mean(sure),
   standart_Sapma=sd(sure))
print(fare_istatistik)
## # A tibble: 2 × 4
##   grup        N ortalama standart_Sapma
##   <chr>   <int>    <dbl>          <dbl>
## 1 deney      50     45.2           8.81
## 2 kontrol    50     52.4           7.92
  1. normallik testi
#her grup için ayrı ayrı normallik testi
fare_verisi %>%
  group_by(grup)%>%
  summarise(shapiro_p=
  shapiro.test(sure)$p.value)
## # A tibble: 2 × 2
##   grup    shapiro_p
##   <chr>       <dbl>
## 1 deney       0.409
## 2 kontrol     0.810

levane testi

leveneTest(sure~grup, data = fare_verisi)
## Warning in leveneTest.default(y = y, group = group, ...): group coerced to
## factor.
## Levene's Test for Homogeneity of Variance (center = median)
##       Df F value Pr(>F)
## group  1  0.5295 0.4686
##       98
#bağımsız örneklem t testi
sonuc <- t.test(sure~grup, data=fare_verisi, var.equal=TRUE)
print(sonuc)
## 
##  Two Sample t-test
## 
## data:  sure by grup
## t = -4.3425, df = 98, p-value = 3.436e-05
## alternative hypothesis: true difference in means between group deney and group kontrol is not equal to 0
## 95 percent confidence interval:
##  -10.601619  -3.951181
## sample estimates:
##   mean in group deney mean in group kontrol 
##               45.1614               52.4378

yapılan bağımsız örneklem t testi sonucunda , ilaç verilen deney grubunun labirent tamamlama sürelerinim(x=45.16,ss=8.81), kontrol grubuna göre(x=52.44, ss=7.92) anlamlı derecede daha düşük( hızlı) olduğu saptanmıştır, t(98)=-4.34, p<.001 , d=0.87. bu bulgu, ilaç x in mekansal bellek ve öğrenme üzerinde geliştirici etkisi olduğunu desteklemektedir.