A survey shows that 40 U.S. Senators are between the ages of 50 and 59. Show all of your work clearly. Draw the circle diagram for the following argument. All mammals have at least two legs. All apes have at least two legs.
All apes are mammals.
Suppose you find some carpet in a German store priced at 32 marks per square meter. Assume that each bill is 0.2 millimeters thick. Only deductive arguments can be valid. The argument is invalid. An observational study with case controls.