A questionnaire is randomly administered to 11 students from State School x and to 15 students from State School y. The results have been ordered and stored in the data frame STSCHOOL.
STSCHOOLA data frame with 26 observations on the following 4 variables:
x (satisfaction score)
y (satisfaction score)
satisfaction (combined satisfaction scores)
school (a factor with levels x and y)
Ugarte, M. D., Militino, A. F., and Arnholt, A. T. 2015. Probability and Statistics with R, Second Edition. Chapman & Hall / CRC.
with(data = STSCHOOL, t.test(x, y, var.equal=TRUE))
#>
#> Two Sample t-test
#>
#> data: x and y
#> t = 2.0798, df = 24, p-value = 0.0484
#> alternative hypothesis: true difference in means is not equal to 0
#> 95 percent confidence interval:
#> 0.05691592 14.85217499
#> sample estimates:
#> mean of x mean of y
#> 83.45455 76.00000
#>