Blood Alcohol Content

Two volunteers each consumed a twelve ounce beer every fifteen minutes for one hour. One hour after the fourth beer was consumed, each volunteer's blood alcohol was measured with a different breathalyzer from the same company. The numbers recorded in data frame Bac are the sorted blood alcohol content values reported with breathalyzers from company X and company Y. Data are used in Example 9.15.

Format

A data frame with 10 observations on the following 2 variables:

X

blood alcohol content measured in g/L

Y

blood alcohol content measured in g/L

Source

Ugarte, M. D., Militino, A. F., and Arnholt, A. T. (2008) Probability and Statistics with R. Chapman & Hall/CRC.

Examples

with(data = Bac,
var.test(X, Y, alternative = "less"))
#> 
#> 	F test to compare two variances
#> 
#> data:  X and Y
#> F = 0.22222, num df = 9, denom df = 9, p-value = 0.01764
#> alternative hypothesis: true ratio of variances is less than 1
#> 95 percent confidence interval:
#>  0.0000000 0.7064207
#> sample estimates:
#> ratio of variances 
#>          0.2222222 
#>