When the experiment is between-samples, that means the levels are independent and we use an independent samples t-test.

1t.test(Pages ~ Site, data=pgviews, var.equal=TRUE)
2
3#

This is a parametric test.

Report the test

How do we report this test?

1pgviews: t(498) = -7.21, p<.0001

where 498 is the degrees of freedom, t is the t-statistics, and p is the p-value.

References

• variable-types
• measurement-errors
• test-of-proportions
• https://www.coursera.org/learn/designexperiments
• validity-in-design-and-analysis
• test-the-anova-assumptions