Before the 1936 Presidential Election in the United States, a magazine titled Literary Digest released the results of an opinion poll predicting the republican candidate Alf Landon would win by a large margin. The magazine sent post cards to approximately ten million prospective voters. These were selected from the subscription list of the magazine, from automobile registration lists, from phone lists, and from club membership lists. Approximately 2.3 million people returned the postcards. Who made up the sample for this study? Question 9 options: The 10 million people who were sent post cards The 2.3 million people who returned the post cards All residents of the United States All subscribers of the magazine Literary Digest The proportion of the 2.3 million respondents who were going to vote for Alf Landon