Perform the following steps:

1. We first plot the data of mtcars with the boxplot function:

        > boxplot
        (mtcars$mpg~mtcars$am,ylab='mpg',names=c('automatic','manual'))

2. Next, we still perform a Wilcoxon Rank Sum test to validate whether the distribution of automatic transmission cars is identical to that of manual transmission cars:

        > wilcox.test(mpg ~ am, data=mtcars)
        Output:
         Wilcoxon rank sum test with continuity correction
        data: mpg by am
        W = 42, p-value = 0.001871
        alternative hypothesis: true location shift is not equal to 0
        Warning message:
        In wilcox.test.default(x = c(21.4, 18.7, 18.1, 14.3, 24.4, 22.8, :
         cannot compute exact p-value with ties