According to the regression results, we can say that the average number of hours that a person who is 40 years old sleeps at night is O 7.1 8.4 7.7 O 6.8 Question 30 BERESSE 0.5 pts Refer to the Exhibit Sleep Time. The percentage of variation in hours of sleep per night explained by the age of adults is 39.07% 11.23% O 15.27% 2.68%