Question 4: A psychologist is investigating the effects of background music and lighting conditions on problem-solving abilities. The study involves two independent variables: Background Music: a. Level 1: Classical Music b. Level 2: No Music Lighting Condition: a. Level 1: Bright Light b. Level 2: Dim Light Dependent Variable: Problem-Solving Score (measured on a scale of 0-100) Participants: 40 participants are randomly assigned to one of the four conditions (10 participants per condition). Classical Background Music No Music 78 64 82 62 76 63 80 65 Bright 79 60 85 61 83 59 81 58 84 57 77 56 Lighting 72 54 70 52 73 53 75 51 74 50 69 49 Dim 71 48 68 47 67 46 66 45