J.C. wants to determine if there is a relationship between room color and sleep. Based on his research, J.C. makes an educated guess that people fall asleep more quickly in a room painted blue than in a room painted yellow. He asks several people which color they like better, yellow or blue, and uses their responses to see if his educated guess was correct. What is missing from J.C.'s scientific investigation? a. experiement testing hypothesis b. research on topic to see what others learned. c.hypothesis based on research that can be tested d.analysis of responses from all test subjects