Data on pH for 16 random batches of low and high volt electr

Data on pH for 16 random batches of low and high volt electrolyte were collected. The data are given by
Low volt: 7.78 5.77 7.08 6.75 7.09 8.27 6.5 5.16 6.81 7.28 7.88 7.87 7.2 5.95 6.58 6.99 and

(a) Use boxplot(sample1,sample2) to draw the side-by-side boxplot, where sample1 and sample2 are the names of the data vector your give in R. Do you think it is reasonable to assume 12 = 2 based on the plot?

(b) Use R to find sample variances and follow the 4 steps to test H0 : 12 = 2 against H1 : 12 = 2, where 12 and 2 are the population variance of low volt and high volt, respectively.

(c) In R, command var.test(sample1, sample2) can be used to test equal variance assumption, where sample1 and sample2 are the names of the data vector your give in R. Compare the R output with your calculation in part (b).

Solution