I am doing a project on R commander and the project says, "The set of exoplanets discovered to this day is a sample of all exoplanets that exist in the universe. Discuss whether you think this sample is random (i.e., representative of the population)." How do I calculate this on R commander?
OK, so you have a big bias on your sample which is the way they are discovered, their ellipse size (distance), size, speed (frequency), reflectiveness, etc. The trick is accounting for this. Most of the big, close, reflective, or frequent exoplanets must be found already, not the same for the small slow, or dark. Simply because we can't see them. So, your sample is NOT a random sample of the exoplanet population, this means you can't infer from the discovered ones the characteristics of the entire population. You can infer for that subset of the exoplanet population with this characteristics. If you had the chances of discovery for small versus big/ dark and reflective/... you could tell the characteristics of the entire population... but you don't have that no do you!