A forensic researcher wanted to test the validity of the polygraph or "lie detector” machine. She recruited ten test subjects. All test subjects were male high school graduates
between the ages of 20 and 25. She wrote a list of ten questions and asked the subjects
to tell the truth on questions 1, 2, 5, 8, and 10, and lie on questions 3, 4, 6, 7, and 9. She
recorded the blood pressure of all test subjects during all ten questions.
What is a valid hypothesis for this experiment?
Select one:
O a. Can the polygraph machine really distinguish lies from truthful statements?
O b. Men tend to respond better than women to polygraph tests.
O c. Blood pressure will be above baseline when subjects answer untruthfully.
O d. Some test subjects will pass and some will fail the polygraph test.