The mean quantity of hours slept each night by Americans in their 20s is 5.9 hours with a standard deviation of 0.4 hours. You believe this is too high. You think that Americans in their 20s sleep fewer than an average of 5.9 hours each night. A survey is taken on 206 students in their 20s. Their mean quantity of hours slept each night is 5.9. You are going to run a hypothesis test at a 5% level of significance to see if there is evidence that the quantity of hours slept by Americans in their 20s is less than the claimed 5.9 hours each night. Select the appropriate null hypothesis for this scenario. H0: = 5.9 H0: 5.9 H0: = 0.4 H0: = 0.1 H0: = 5% HA: 5.9 H0: < 5.9 H0: = 0.05 H0: > 206 H0: > 5.9