A regression analysis explores the relationship between sleep duration (X) and stress level (Y). The analysis establishes that a person with zero sleep duration is expected to have a stress level of 25. The data reveal an average sleep duration of 7 hours and an average stress level of 15. For every hour of sleep, a person's stress level is expected to decrease by how much? Question 39 options: a) 160 b) 1.43 c) 11.43 d) 1.20