Stats 2.0 Practice Milestone 1&2

Stats 2.0 Practice Milestone 1&2 QUESTION 1 One typical way to select a sample is to randomly pick phone numbers from a telephone book. This method can introduce __________, because those that cannot afford a telephone, chose not to have a telephone, or do not list their phone numbers will not be represented. QUESTION 2 A __________ variable is an unforeseen variable that is related to the explanatory variable and has a significant effect on the response variable.