SOPHIA PATHWAYS FOR COLLEGE CREDIT – STATISTICS PRACTICE MILESTONE 1

Are you ready to take Milestone 1? Taking this practice test is a stress-free way to find out if you are ready for Milestone 1 assessment. You can print it and test yourself to discover your strengths and weaknesses. The answer key is at the end of this practice milestone. 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. Solution guide Tutorials that teach this concept The sample is collected in a way that leaves out those that do not have a phone or those who choose to not publish their phone numbers in the phone book. Therefore, the sample is not representative of the population. data, bias, Sampling QUESTION 2 A __________ variable is an unforeseen variable that is related to the explanatory variable and has a significant effect on the response variable. Solution guide Tutorials that teach this concept Remember that the explanatory variable is the independent variable that has an effect on the response variable (dependent variable). When we can’t tell if it is in fact the explanatory variable affecting the response variable, or if it is another variable that was taken into account, what do we call that? variables, confounding