The US Bureau of Labor Statistics' 2019 American Time Use Survey sampled 9247 random US adults to find out how much time they spent on various activities every day. We will use this data to st K test, at the 1% significance level, whether US adults average less than the recommended 8 hours of sleep per day. What is the population of interest? O A. 9247 random US adults in 2019 O B. Time spent sleeping in 2019 O C. 8 hours O D. All US adults in 2019 What is the variable of interest? O A. 9247 random US adults in 2019 O B. Time spent sleeping in 2019 O C. All US adults in 2019 O D. 8 hours What is the parameter of interest? O A. p = time spent sleeping by a random US adult in 2019 O B. H = the average time spent sleeping for all US adults in 2019 O C. u = time spent sleeping by adults in 2019 who slept more than 8 hours O D. u = the average time spent sleeping for the 9247 random US adults in 2019 What are the hypotheses? O A. Ho: H = 8 OB. Ho: H = 8 OC. Ho: H = 8 OD. Ho: H # 8 Hai H 8 Hail # 8 Ha: H = 8 What is the significance level? A 101