Using R for Introductory Statistics : John Verzani

Using R for introductory statistics 238a t-test to see if there is a difference in the mean height. Assume the paired t-test isappropriate. What problems are there with this assumption?8.36 The question of equal variances comes up when we perform a two sample ttest.We’ve answered this based on a graphical exploration. The F-test for equal variances oftwo normal populations can be used to test formally for equality. The test statistic is theratio of the sample variances, which under the null hypothesis of equal variances has anF-distribution. This test is carried out by the function var. test(). A two-sided testis done with the command var.test(x, y).Do a two-sided test for equality of variance on the data in Example 8.9.