Data Analysis with R, Second Edition - Second Edition

Exercises

Here are a few exercises for you to practise and revise the concepts learned in this chapter:

• Read about data-dredging and p-hacking. Why is it dangerous not to formulate a hypothesis, set an alpha level, and set a sample size before collecting data and analyzing results?

• Use the library(help="datasets") command to find a list of datasets that R has already inbuilt. Pick a few interesting ones and form a hypothesis about each one. Rigorously define your null and alternative hypotheses before you start. Test those hypotheses even if it means learning about other statistical tests.

• How you might quantify the effect size of a one-way ANOVA? Look up eta-squared if you get stuck.

• In ethics, the doctrine of moral relativism holds ...