Data for Exercise 7.68

Kinder

Format

A data frame/tibble with eight observations on three variables

pair

a numeric indicator of pair

kinder

reading score of kids who went to kindergarten

nokinder

reading score of kids who did not go to kindergarten

References

Kitchens, L. J. (2003) Basic Statistics and Data Analysis. Pacific Grove, CA: Brooks/Cole, a division of Thomson Learning.

Examples


boxplot(Kinder$kinder, Kinder$nokinder)

diff <- Kinder$kinder - Kinder$nokinder
qqnorm(diff)
qqline(diff)

shapiro.test(diff)
#> 
#> 	Shapiro-Wilk normality test
#> 
#> data:  diff
#> W = 0.87923, p-value = 0.1852
#> 
t.test(Kinder$kinder, Kinder$nokinder, paired = TRUE)
#> 
#> 	Paired t-test
#> 
#> data:  Kinder$kinder and Kinder$nokinder
#> t = 2.1166, df = 7, p-value = 0.07208
#> alternative hypothesis: true difference in means is not equal to 0
#> 95 percent confidence interval:
#>  -0.2343599  4.2343599
#> sample estimates:
#> mean of the differences 
#>                       2 
#> 
# Or
t.test(diff)
#> 
#> 	One Sample t-test
#> 
#> data:  diff
#> t = 2.1166, df = 7, p-value = 0.07208
#> alternative hypothesis: true mean is not equal to 0
#> 95 percent confidence interval:
#>  -0.2343599  4.2343599
#> sample estimates:
#> mean of x 
#>         2 
#> 
rm(diff)